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Demaorchestia hatakejima sp. nov. (Fig. 5) Orchestia platensis.��� Morino, 1975: 172���175, figs 1���3. Types. Holotype male, 17.5 mm, NSMT-Cr 29013. Paratypes 3 males and 3 females NSMT-Cr 29014. Type locality. Hatakejima Island (Tanabe Bay in Wakayama Prefecture), Japan. Ecological type. Beach-hopper. Habitat. According to Morino (1975) ���This small and more or less compressed species occurs exclusively under stranded matter, living between the substratum and stranded matters, though the substratum conditions vary from fine sandy beach ��� to sandy and pebbly shores.��� Size. Male, 17.5 mm. Diagnosis. Based on Morino (1975). Gnathopod 2 dactylus not modified distally, blunt. Pereopod 6 coxa with anteroventral corner rounded, not produced. Epimeron 3 posterior margin smooth to minutely serrate. Distribution. Japan. Tanabe Bay (Morino 1975)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 11-12, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Morino, H. (1975) Studies on the Talitridae (Amphipoda, Crustacea) in Japan. II. Taxonomy of seashore Orchestia, with notes on the habitats of Japanese seashore talitrids. Publications of the Seto Marine Biology Laboratory, 22 (1 / 4), 171 - 193. https: // doi. org / 10.5134 / 175882"]}

Demaorchestia parapacifica (Kim, Jung & Min, 2013) comb. nov. (Fig. 8) Platorchestia parapacifica Kim, Jung & Min, 2013: 829, figs 2���7. Type material. Holotype, male, 19.2 mm, NIBRIVOOOO268878. Paratypes: 6 male, 5 females, NIBRIV- OOOO268879���87, same data holotype. Type locality. Geumseongcheon Stream, Jeju-do, South Korea (33��26���N 126��17���E). Ecological type. Beach-hoppers. Habitat. ���Living mainly on the sandy shores around river mouths (salinity ranged between 5���20 psu). It is usually found under rotting hay or in silt beside the water.��� (Kim, Jung & Min (2013). Molecular data. 596 bp CO1 gene sequences (GenBank accession numbers KF016044 - KF016047) were obtained from four specimens of the new species. Size. 19.2 mm, female, 13.5 mm. Diagnosis ( male ). Based on Kim, Jung & Min (2013). Gnathopod 2 propodus with midpalmar sinus; dactylus blunt or apically pinched. Epimeron 3 posterior margin smooth. Telson with 10���11 robust setae per lobe . Remarks. Demaorchestia parapacifica is the only species in the genus with at least 10 robust setae on each telson lobe. Distribution. South Korea. Sehwa Beach (33��31���N 126��51���E), Jeju-do, South Korea; Seomjin River (34��59���N 127��46���E), Jeollanam-do, South Korea; Osipcheon Stream (36��21���N 129��22���E), Gyeongsangbuk-do (Kim, Jung & Min, 2013)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 16-17, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Kim, M. - S., Jung, J. - H. & Min, G. - S. (2013) A new beach-hopper, Platorchestia parapacifica n. sp. (Amphipoda: Talitridae), from South Korea, with molecular phylogeny of the genus Platorchestia. Journal of Crustacean Biology, 33, 828 - 842. https: // doi. org / 10.1163 / 1937240 X- 00002186"]}

Demaorchestia pseudojoi sp. nov. (Fig. 9) Platorchestia joi.��� Miyamoto & Morino, 2004: 70, figs 1���3, 15. Types. According to Dr Morino (pers. comm.) the specimens were in the possession of Miyamoto and displaced after his death. Following ICZN recommendation 73 we refer to figures 1���3 of this species in Miyamoto & Morino, 2004. Type locality. Demao, Taiwan. Ecological type. Beach-hoppers, riparian-hoppers. Habitat. Living on sandy shores and riversides near the mouth of rivers. Size. 9 mm. Sexual dimorphism present. Diagnosis ( male ). Based on Miyamoto & Morino (2004). Pereopod 6 coxa posterior with anteroventral corner quadrate or slightly produced. Pereopod 7 not incrassate: basis moderately expanded. Distribution. Taiwan (Miyamoto & Morino 2004)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 17, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317"]}

Subfamily Platorchestiinae subfam. nov. Type genus. Platorchestia Bousfield, 1982, original designation. Included genera. Platorchestiinae includes 15 genera: Cariborchestia Smith, 1998; Chroestia Marsden & Fenwick, 1984; Cocorchestia gen. nov.; Demaorchestia gen. nov.; Insularorchestia gen. nov.; Laniporchestia Lowry & Myers, 2019; Mauritiorchestia Green, Appadoo, Lowry & Myers, 2021; Mexorchestia Wildish & LeCroy, 2014; Miyamotoia Morino, 2020; Morinoia Lowry & Myers, 2019; Pickorchestia Lowry & Myers, 2019; Platorchestia Bousfield, 1982; Tethorchestia Bousfield, 1984; Vallorchestia Lowry, 2012 and Yamatorchestia Takahashi & Morino, 2020. Ecological types. Beach-hoppers, marsh-hoppers, sand-hoppers, driftwood-hoppers, moss-hoppers, field-hoppers, forest-hoppers, riparian-hoppers and cave-hoppers. Diagnostic description ( male ). Based on Miyamoto & Morino (2004) and Lowry & Myers (Delta Database to World Talitroidea) Head. Antenna 2 peduncular articles slender or incrassate; article 3 without plate ventrally. Mandible left lacinia mobilis 4-, 5, or 6- cuspidate. Maxilliped palp article 2 with distomedial lobe. Labium with or without inner lobes or with possible vestigial inner lobes. Pereon. Gnathopod 1 subchelate ; posterior margin of carpus and propodus each with lobe covered in palmate setae; dactylus simplidactylate or cuspidactylate. Gnathopod 2 subchelate ; propodus palm acute or transverse, evenly rounded, rounded distally, sigmoidal or irregular, without large recurved robust setae lining palm, with or without sinuses along palmar margin, with or without a proximal spine or thumb defining palm; dactylus not modified distally and blunt or short or recurved distally, attenuated distally or slender, distally acute. Pereopods 3���7 bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3 or subequal or slightly shorter than pereopod 3; carpus similar in length to pereopod 3 or significantly shorter than carpus of pereopod 3; dactylus amplidactylate or homobasidactylate, dactylus similar to pereopod 3 dactylus, not thickened proximally or notched or thickened proximally with notch midway along posterior margin or short with mini-wavy posterior margin. Pereopod 6 incrassate or not, basis expanded or moderately expanded. Pereopod 7 incrassate or not. Oostegites (female) setae with simple smooth tips or with spatulate tips. Pleon. Pleopods 1���3 all well-developed or all reduced. Epimera 1���3 without slits along ventral margins . Uropods 1���2 rami without apical spear-shaped setae. Uropod 1 peduncle distolateral robust seta present or distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 or 2 rows. Uropod 2 exopod with marginal robust setae in 1 or 2 rows; endopod with marginal robust setae in 1 or 2 rows. Uropod 3 peduncle with or without 1 or 2 long robust setae dorsal margin. Telson with 3 to 10 robust setae per lobe. Remarks. The Platorchestiinae differ from the Floresorchestiinae in having no slits along the ventral margins of the epimera. They differ from the Pseudorchestoideinae in having no distal spear-shaped setae on the uropodal rami. The Platorchestiinae differ from the Talitrinae in having the combination of gnathopod 1 subchelate; with palmate lobes on the carpus and propodus but absent on the merus; uropod 1 without marginal robust setae on the exopodite. Talitrinae that exhibit some combination of these character states are Talorchestia, Sinorchestia and Vietorchestia but they have a parachelate gnathopod 1 and Pyatokovestia, that has a palmate lobe on the merus. Aokiorchestia Morino, 2020 differs from the Platorchestiinae in having a row of marginal setae on the exopod of uropod 1. Talorchestia Dana, 1852, also differs from the Platorchestiinae in having the male gnathopod 2 palm strongly acute with large, recurved robust setae along the palm. Vietorchestia is poorly described but apparently has no distomedial lobe on article 2 of the maxilliped palp. This character state would seemingly exclude the genus from the Talitridae, but its similarity to Talorchestia would suggest that if the structure is truly missing it is probably convergent with Talorchestia the loss being a homoplasy rather than a synapomorphy. Distribution. Atlantic Ocean. USA Atlantic coast (Bousfield 1973), Gulf of Mexico (Wildish & LeCroy, 2014) and Caribbean Sea (Smith 1998, Wildish & LeCroy 2014). Brazil, Venezuela (Stebbing, 1903, Stephensen 1948). Atlantic Ocean Saint Helena Island (Stock 1996), Ascension Island (Stock & Biernbaum 1994) and the Azores (Mateus, Mateus & Afonso 1986). Baltic Sea, European coast, Mediterranean Sea (Chevreux & Fage 1925, Bellan- Santini & Krapp-Schickel 1993); Israel (Morino & Ortal, 1995). Pacific Ocean. Canada. China (Hou & Li 2005), Hawaii (Richardson 1991), Galapagos (Monod 1970), Costa Rica (Stebbing, 1903, Shoemaker 1932, Monod 1970). Tonga (Lowry & Bopiah, 2013). Australia: Queensland (Marsden & Fenwick 1984), New South Wales, South Western Australia (Serejo & Lowry 2008). Fiji (Myers 1985). Eastern Russia (Derzhavin 1937), Korea (Kim & Kim 1987), Japan (Jo 1988, Morino 2020, Takahashi et al. 2021), Taiwan (Miyamoto & Morino 2004, Cheng et al. 2011, Kim, Jung & Min 2013). Indian Ocean. Mauritius (Green et al. 2021). Iraq (Salman & Abdullah 1997). India (Chilton 1921); South Africa (Griffiths 1975)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 2-3, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Bousfield, E. L. (1982) The amphipod superfamily Talitroidea in the northeastern Pacific region. Family Talitridae. Systematics and distributional ecology. National. Museum of Natural Science, Publications in Biological Oceanography, 11, i - vii + 1 - 73.","Smith, D. G. (1998) A new genus and species of terrestrial amphipod from Isla Mona in the Caribbean Sea. Spixiana, 21 (2), 170 - 186.","Marsden, I. D. & Fenwick, G. D. (1984) Chroestia, a new supralittoral amphipod genus from Queensland, Australia (Talitroidea: Talitridae). Journal of Natural History, London, 18, 843 - 851. https: // doi. org / 10.1080 / 00222938400770731","Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Wildish, D. J. & LeCroy, S. E. (2014) Mexorchestia: a new genus of talitrid amphipod (Crustacea, Amphipoda, Talitridae) from the Gulf of Mexico and Caribbean Sea, with the description of a new species and two new subspecies. Zootaxa, 3865 (4), 555 - 577. https: // doi. org / 10.11646 / zootaxa. 3856.4.5","Morino, H. (2020) The Description of Two New Genera and Four New Species of the Terrestrial Talitridae (Crustacea, Amphipoda) from the Ogasawara and Daito Islands, Southern Japan. Bulletin of the National Museum of Natural Science, Series A, 46 (1), 1 - 23.","Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amphipoda: Talitridae) of the Indo-Pacific Region. Bishop Museum Special Publication, 72, 171 - 210.","Lowry, J. K. (2012) Talitrid amphipods of ocean beaches in New South Wales, Australia (Amphipoda, Talitridae). Zootaxa, 3575 (1), 1 - 26. https: // doi. org / 10.11646 / zootaxa. 3575.1.1","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Dana, J. D. (1852) Conspectus crustaceorum quae in orbis terrarum circumnavigatione, CAROLO WILKES e classe Reipublicae Faederatae Duce, lexit et descripsit JACOBUS D. DANA Pars III. [Amphipoda. No. 1.]. Proceedings of the American Academy of Arts and Sciences, 2, 201 - 220.","Bousfield, E. L. (1973) s. n. In: Shallow-water gammaridean Amphipoda of New England. Cornell University Press, Ithaca, New York and London, pp. vii - xii + 1 - 312, 13 figs., 69 pls.","Stebbing, T. R. R. (1903) Amphipoda from Costa Rica. Proceedings of the United States National Museum, 26, 925 - 931, pls. 60 - 61. https: // doi. org / 10.5479 / si. 00963801.26 - 1341.925","Stephensen, K. (1948) Amphipods from Curacao, Bonaire, Aruba and Margarita. Studies on the Fauna Curacao, Aruba, Bonaire, Venezuelan Islands, 11, 1 - 20.","Stock, J. H. (1996) The genus Platorchestia (Crustacea, Amphipoda) on the Mid-Atlantic islands, with description of a new species from Saint Helena. Miscellania Zoologica, 19 (1), 149 - 157.","Stock, J. H. & Biernbaum, C. K. (1994) Terrestrial Amphipoda (Talitridae) from Ascension and Saint Helena (South Central Atlantic). Journal of Natural History, 28, 795 - 811. https: // doi. org / 10.1080 / 00222939400770411","Chevreux, E. & Fage, L. (1925) Amphipodes. Faune de France, 9, 1 - 488 pp., 438 figs.","Morino, H. & Ortal, R. (1995) Two Platorchestia species (Amphipoda, Talitridae) from Israel. Crustaceana, 68, 824 - 832. https: // doi. org / 10.1163 / 156854095 X 00971","Hou, Z. - E. & Li, S. (2005) Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History, 39 (36), 3255 - 3274. https: // doi. org / 10.1080 / 00222930500289590","Richardson, A. M. M. (1991) Two new species of landhoppers (Crustacea: Talitridae) from O'ahu, Hawaiian Islands, with redescription of Platorchestia pickering i and key to landhoppers of O'ahu. Bishop Museum Occasional Papers, 31, 185 - 201.","Shoemaker, C. R. (1932) Notes on Talorchestia fritzi Stebbing. Journal of the Washington Academy of Sciences, 22 (7), 184 - 187.","Lowry, J. K. & Bopiah, A. (2013) The talitrid amphipods of Tonga (Crustacea, Amphipoda, Talitridae). Zootaxa, 3681 (4), 347 - 370. https: // doi. org / 10.11646 / zootaxa. 3681.4.2","Serejo, C. S. & Lowry, J. K. (2008) The coastal Talitridae (Amphipoda, Talitroidea) of Southern and Western Australia with Comments on Platorchestia platensis (Kroyer, 1845). Records of the Australian Museum, 60 (2 / 3), 161 - 206. https: // doi. org / 10.3853 / j. 0067 - 1975.60.2008.1491","Myers, A. A. (1985) Shallow-water, coral reef and mangrove Amphipoda (Gammaridea) of Fiji. Records of the Australian Museum, Supplement 5, 1 - 143. https: // doi. org / 10.3853 / j. 0812 - 7387.5.1985.99","Derzhavin, A. N. (1937) Talitridae of the Soviet Coast of the Japan Sea. Issledovaniya Fauny Morej SSSR, 23, 87 - 112. [in Russian with English summary]","Kim, H. - S. & Kim, C. B. (1987) Marine gammaridean Amphipoda (Crustacea) of Cheju Island and its adjacent waters, Korea. Korean Journal of Systematic Zoology, 3 (1), 1 - 23.","Jo, Y. W. (1988) Talitridae (Crustacea - Amphipoda) of the Korean coasts. Beaufortia, 38 (7), 153 - 179.","Takahashi, T., Morino, H., Tomikawa, K., Lai, Y. - T. & Takafumi, N. (2021) Molecular phylogenetic position of Minamitalitrus zoltani elucidates a further troglobisation pattern in cave-dwelling terrestrial amphipods (Crustacea: Talitridae). Molecular Phylogenetics and Evolution, 154 (106984), 1 - 6 https: // doi. org / 10.1016 / j. ympev. 2020.106984","Cheng, Y. T., Nakazono, K., Lin, Y. K. & Chan, B. K. K. (2011) Cryptic diversity of the semi-terrestrial amphipod Platorchestia japonica (Tattersall, 1922) (Amphipoda: Talitrida: Talitridae) in Japan and Taiwan, with description of a new species. Zootaxa, 2787 (1), 1 - 18. https: // doi. org / 10.11646 / zootaxa. 2787.1.1","Kim, M. - S., Jung, J. - H. & Min, G. - S. (2013) A new beach-hopper, Platorchestia parapacifica n. sp. (Amphipoda: Talitridae), from South Korea, with molecular phylogeny of the genus Platorchestia. Journal of Crustacean Biology, 33, 828 - 842. https: // doi. org / 10.1163 / 1937240 X- 00002186","Salman, S. D. & Abdullah, A. E. (1997) The first record of Platorchestia monodi (Mateus et al., 1986) from south of Iraq. Marina Mesopotamica, 12 (1), 39 - 46.","Chilton, C. (1921) Amphipoda. Fauna of Chilka Lake. Memoirs of the Indian Museum, 5 (8), 519 - 558, figs. 1 - 12 b.","Griffiths, C. L. (1975) The Amphipoda of southern Africa. Part 5. The Gammaridea and Caprellidea of the Cape Province west of Cape Agulhas. Annals of the South African Museum, 67, 91 - 181."]}

Tethorchestia karukerae Ciavatti, 1989 (Fig. 23) Tethorchestia karukerae Ciavatti, 1989: 140, figs 15���17.��� Wildish & LeCroy, 2014: 569, key. Thetorchestia (sic) karukerae.��� Ortiz, Martin & Diaz, 2007: 516. Types. Holotype male MNHN Am 2430, paratypes 4 males MNHN Am 2432. Allotype 1 female MNHN Am 2431, paratypes 4 females MNHN Am 2433. Type locality. Anse �� la Barque de St-Fran��ois, Grande-Terre de Guadeloupe. Ecological type. Beach-hopper. Habitat. Marine supralittoral, sand beach inside reef. Size. Male, 7.4 mm, female, 10.4 mm. Diagnostic description ( male ). Based on Ciavatti (1989). Gnathopod 2 dactylus short, distally acute. Pereopod 6 shorter than pereopod 7; not incrassate; basis moderately expanded; male merus expanded, carpus not expanded (slightly). Pereopod 7 basis broadly expanded. Telson with 4���5 robust setae per lobe. Remarks. See remarks under T. antillensis. Distribution. Guadeloupe. Grande-Terre de Guadeloupe (Ciavatti 1989)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 42-43, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Ciavatti, G. (1989) Les Talitres (Crustacea. Amphipoda) des plages de la Guadeloupe. Description de deux especes nouvelles. Annales de l'Institut Oceanographique, Paris, 65 (2), 127 - 146. [in French]","Wildish, D. J. & LeCroy, S. E. (2014) Mexorchestia: a new genus of talitrid amphipod (Crustacea, Amphipoda, Talitridae) from the Gulf of Mexico and Caribbean Sea, with the description of a new species and two new subspecies. Zootaxa, 3865 (4), 555 - 577. https: // doi. org / 10.11646 / zootaxa. 3856.4.5","Ortiz, M., Martin, A. & Diaz, Y. (2007) Lista y referencias de los crustaceos anfipodos (Amphipoda: Gammaridea) del Atlantico occidental tropical. Revista da biologia. Tropical, 55 (2), 479 - 498. https: // doi. org / 10.15517 / rbt. v 55 i 2.6026"]}

Mexorchestia carpenteri Wildish & LeCroy, 2014 (Fig. 15) Tethorchestia species B: Bousfield, 1984, pp. 204–205, table. 6. — Camp et al., 1998: 131. “ Tethorchestia ”.— LeCroy, 2011, pp. 757–758, fig. 590. Mexorchestia carpenteri carpenteri Wildish & LeCroy, 2014: 562, figs 3–6, 569, key. Mexorchestia carpenteri raduloviciae Wildish & LeCroy, 2014: 568, figs 7–8, 569, key. Non-Taxonomic Citations Mexorchestia carpenteri carpenteri.— Wildish et al., 2016: 1916, table 1 (zoogeography). Types. Holotype, male, 11.5 mm, USNM 1218141. Paratypes: female, 8 mm length, USNM 1218142; 9 males, 5 females, 1 juvenile, USNM 1218143; 1 male, 6 females, CMNC-2012-0020; 2 males; 2 females, USNM 1218144; 13 males, 18 females, 4 juveniles, GCRL 06521. Type locality. Tiger Tail Beach, Marco Island, Florida, USA. (25°56.7'N 81°44.6 '). Ecological type. Beach-hopper. Habitat. Saltmarsh behind the main beach facing the Gulf of Mexico, with a brackish pool subject to tidal changes. Beach-hoppers sheltered under the damp digging wastes and not burrowing. Possibly feeding on the microalgae within the digging pellets (after Wildish & LeCroy 2014). Size. Male, 11.5 mm, female, 8 mm. Diagnosis. Based on Wildish & LeCroy (2014). Antenna 2, flagellum with 13–21 articles in adult males; ovigerous female antenna 2 with 11–13 articles, oostegite 2 with 17–35 marginal setae; telson, each lobe with 1 to 2 distal dorsolateral robust seta; dorsal pigment pattern in both sexes diamond-shaped or diffuse on cephalon (may be absent), linear, quadrate club-shaped or diamond-shaped on mid-line of pleon (present or absent). Remarks. Wildish & LeCroy (2014) set up two subspecies: Mexorchestia carpenteri carpenteri based on antenna 2, flagellum with 13–18 articles in adult males; ovigerous female antenna 2 with 11–13 articles, oostegite 2 with 17–35 marginal setae; telson, each lobe with 1 distal dorsolateral robust seta; dorsal pigment pattern in both sexes diamond-shaped on cephalon (may be absent), linear, quadrate or diamond-shaped on mid-line of pleon (always present) and Mexorchestia carpenteri raduloviciae based on Antenna 2, flagellum with 18–21 articles in adult males longer than 9 mm; ovigerous female antenna 2 with 15–19 articles, oostegite 2 with 15–19 marginal setae; telson, each lobe with 2 distal dorsolateral robust setae; dorsal pigment pattern in both sexes diffuse on cephalon (may be absent); linear, club-shaped or absent on mid-line of pleon. Distribution. USA, Mexico, Belize. North-western Atlantic: Titusville to Ft. Lauderdale, Florida. Gulf of Mexico: Lower Florida Keys to South Padre Island, Texas. Caribbean Sea: Quintana Roo, Yucatan Peninsula, Mexico to Turneffe Island, Belize (Wildish & LeCroy 2014).

Morinoia paludosus (Cheng, Nakazono, Lin & Chan, 2011) (Fig. 20) Platorchestia japonica.��� Miyamoto & Morino 2004: 83���88, figs 8���10, 15. Platorchestia paludosus Cheng, Nakazono, Lin & Chan, 2011: 4, figs 2���10. Morinoia paludosus Lowry & Myers, 2019: 61, fig. 27. Types. Holotype, male, NMNS ���6519-001. Paratypes: 4 males and 4 females, NMNS 6519-002 ― 06519-009; 2 males and 2 females, AM P.84807); 2 males and 2 females, ASIZCR 000230. Type locality. Guan-du, Taipei County, Taiwan. Ecological type. Marsh-hopper. Habitat. Marsh-hopper living in salt marshes and under fallen leaves and grass in humid places such as banks of streamlets and paddy fields. According to Cheng et al. 2011 the salt marsh in Guan-du, Taiwan is dominated by Phragmites communis (L.) Trin. and Brachiaria mutica (Forsk) Stapf., with irregular flooding after raining. Platorchestia paludosus was found under leaf-litter of Brachiaria mutica (Forsk) on the water front of estuarine marshes. Size. 7���8 mm. Diagnosis. Based on Miyamoto & Morino (2004). Pleopods rami about as long as peduncle. Uropod 3 ramus about 0.7 �� length of peduncle. Telson with 4 robust setae per lobe. Remarks. See remarks under M. humicola and under M. japonica. Distribution. Taiwan: Guan-du (Cheng et al. 2011); Tanshui and Nanfang-ao (Miyamoto & Morino 2004)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 36-37, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Cheng, Y. T., Nakazono, K., Lin, Y. K. & Chan, B. K. K. (2011) Cryptic diversity of the semi-terrestrial amphipod Platorchestia japonica (Tattersall, 1922) (Amphipoda: Talitrida: Talitridae) in Japan and Taiwan, with description of a new species. Zootaxa, 2787 (1), 1 - 18. https: // doi. org / 10.11646 / zootaxa. 2787.1.1","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1"]}

Chroestia Marsden and Fenwick, 1984 Chroestia Marsden & Fenwick, 1984: 843. Type species. Chroestia lota Marsden & Fenwick, 1984, monotypy. Included species. Chroestia contains 1 species: C. lota Marsden & Fenwick, 1984. Category. Mascupod. Ecological type. Beach-hoppers. Habitat. In thick mats of Zostera and mangrove debris on a small sand-gravel beach at the top of an extensive mud flat area. Diagnostic description ( male ). Based on Marsden & Fenwick, 1984. Head. Antenna 2 peduncular articles slender or slightly incrassate . Mandible left lacinia mobilis 4-cuspidate. Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 or 4 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute, evenly rounded or sigmoidal, with or without proximal sinuses, without distal sinus; without proximal spine or thumb defining palm; dactylus short, recurved distally or attenuated distally. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin or short, thickened. Pereopod 6 shorter than pereopod 7, not incrassate; basis moderately expanded; male merus expanded, carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin smooth or minutely serrate margin with numerous small robust setae, posterodistal lobe present, shallow, narrowly rounded; merus slightly expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded, subrectangular, subequal to or shorter than propodus; propodus broad, length 5.9 �� width, propodus without large distal tuft of setae. Oostegites (female) setae with curled tips. Pleon. Pleopods 1���3 all well-developed . Uropod 1 peduncle distolateral robust seta present (large); exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 1 row or with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson completely cleft, apically incised, with at least 10 robust setae per lobe. Remarks. Chroestia has no obvious relationship with any other platorchestiine genus. Based on the slender second antenna, simplidactylate first gnathopod and large number of setae on the telson it is most similar to the Japanese genus Miyamotoia. They differ most obviously in the pleopod development (all well-developed in Chroestia, all reduced in Miyamotoia). Distribution. Australia. Lota, Queensland (Marsden & Fenwick 1984)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 5-6, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Marsden, I. D. & Fenwick, G. D. (1984) Chroestia, a new supralittoral amphipod genus from Queensland, Australia (Talitroidea: Talitridae). Journal of Natural History, London, 18, 843 - 851. https: // doi. org / 10.1080 / 00222938400770731"]}

Insularorchestia ashmoleorum (Stock, 1996) comb. nov. (Fig. 10) Platorchestia ashmoleorum Stock, 1996: 151, figs 1, 2���4 (in part).��� Miyamoto & Morino, 2004: 69, 88.��� Serejo, 2004: 20, table 2.��� Lowry, 2012: 14, (key). Non-Taxonomic Citations Platorchestia ashmoleorum.��� Wildish & Radulovici, 2019: 2418, table 2, (zoogeography). Types. Holotype, male, 9.2 mm, ZMA. Paratypes: female, 8.5 mm, ZMA; 4 males, 5 females ZMA; 10 males, 10 females ZMA; 1 male, 4 females ZMA; 1 males, 1 female ZMA; 1 male, 4 females ZMA. Type locality. Broad Gut, near junction with Gates of Chaos, St Helena Island, South Atlantic Ocean (50��59���59.84������S 5��44���00.07������W). Ecological type. Land-hopper, often near freshwater streams. Habitat. Semi-terrestrial. Freshwater streams. According to Stock, (1996) Insularorchestia ashmoleorum ���has been encountered only along small guts (=streams) in the dry and hot lowland zone (altitudes 1���40 m) and close to the sea (at 300���750 m in direct line). The gut water in these areas is often slightly salty, not so much through marine influence, as by salts dissolved after rains from the volcanic rocks and sediments. The two talitrid species were never found together���. Size. Male, 9.2���10 mm, female, 8.5 mm. Diagnosis (male). Based on Stock (1996). Gnathopod 1 simplidactylate. Gnathopod 2 propodus palm evenly rounded, without proximal sinus; dactylus short, recurved distally with slight posterior projection near dactylar hinge. Pereopod 7 not incrassate; propodus broad; length 6.6 �� width. Uropod 1 endopod with marginal robust setae in 2 rows . Remarks. Insularorchestia ashmoleorum exhibits a homoplasy with Platorchestia ano in which the distal end of the gnathopod 2 dactylus is distinctively shortened and recurved. The simplidactylate dactylus on male gnathopod 1 distinguishes it from these species. Like Morinoia, I. ashmoleorum has no sexual dimorphism in P7, but Morinoia does not have an incrassate A2. Distribution. South Atlantic Ocean. St. Helena (Stock 1996)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 19, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stock, J. H. (1996) The genus Platorchestia (Crustacea, Amphipoda) on the Mid-Atlantic islands, with description of a new species from Saint Helena. Miscellania Zoologica, 19 (1), 149 - 157.","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Serejo, C. S. (2004) Talitridae (Amphipoda, Gammaridea) from the Brazilian coastline. Zootaxa, 646 (1), 1 - 29. https: // doi. org / 10.11646 / zootaxa. 646.1.1","Lowry, J. K. (2012) Talitrid amphipods of ocean beaches in New South Wales, Australia (Amphipoda, Talitridae). Zootaxa, 3575 (1), 1 - 26. https: // doi. org / 10.11646 / zootaxa. 3575.1.1","Wildish, D. J. & Radulovici, A. E. (2019) Zoogeography and evolutionary ecology of the genus Platorchestia (Crustacea, Amphipoda, Talitridae). Journal of Natural History, 53 (39 - 40), 2413 - 2435. https: // doi. org / 10.1080 / 00222933.2019.1704463"]}

Mauritiorchestia fayetta Green, Appadoo, Lowry & Myers, 2021 (Fig. 14) Platorchestia fayetta Beeltah & Appadoo, 2017: 44 (nomen nudum). Type material. Holotype, male, 9.9 mm, MNHN / 2021/01/01. Paratype, female, 8.6 mm, MNHN / 2021/02/01, 3 males MNHN / 2021/03/01, 5 females MNHN / 2021/04/01. Type locality. Post la Fayette (20��8.2���S 57��44.5���E). Ecological type. Sand-hoppers. Habitat. On coastal sandy substrate with huge amount of beach wrack algae. Size. 9.8 mm. Sexual dimorphism present. Diagnosis ( male ). With the characters of the genus. Distribution. Mauritius, western Indian Ocean. Poste la Fayette (Green, et al. 2021)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 25-27, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Beeltah, S. & Appadoo, C. (2017) Aspects of the biology of Platorchestia fayetta sp. nov. (Crustacea, Amphipoda) at Poste La Fayette, Mauritius. Western Indian Ocean Journal of Marine Science, Special Issue 1, 43 - 49."]}

Laniporchestia Lowry & Myers, 2019 Platorchestia Bousfield, 1982: 26 (in part.) Platorchestia group 3 of Miyamoto & Morino, 2004: 69. Laniporchestia Lowry & Myers, 2019: 53, fig. 23. Type species. Platorchestia lanipo Richardson, 1991, monotypy. Included species. Laniporchestia contains 1 species: L. lanipo (Richardson, 1991). Ecological type. Tree/moss-hopper. Diagnostic description ( male ). Based on Richardson (1991). Head. Antenna 2 peduncular articles slender or slightly incrassate (?). Mandible left lacinia mobilis 5-cuspidate. Labium without inner lobes. Maxilliped palp slender; article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 2 groups of robust setae, ‘subtriangular’ with well-developed posterodistal lobe, palm transverse; dactylus dactylation unknown. Gnathopod 2 subchelate; propodus palm acute, without palmar sinuses; without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus slightly curved, longer than palm, attenuated distally. Pereopods 3–7 dactyli bicuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus similar in length to that of pereopod 3; dactylus homobasidactylate, similar to pereopod 3 dactylus, not thickened proximally or notched. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus expanded, carpus slightly or not expanded. Pereopod 7 not incrassate ; basis broadly expanded, posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, broadly rounded; merus and carpus unexpanded, subrectangular; carpus shorter than propodus; propodus slender, length 8 × width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all slightly reduced, rami not articulated, shorter than peduncles. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 1 row. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 4 robust setae per lobe. Remarks. Laniporchestia is similar to the Japanese genus Morinoia. It differs from Morinoia Lowry & Myers, 2019 as follows: maxillipedal palp slender (broad in Morinoia); telson rounded distally (tapering distally in Morinoia). Distribution. Hawaii. Oahu (Richardson 1991).

Vallorchestia dispar (Dana, 1852) (Fig. 24) Orchestia dispar Dana, 1852: 204.��� Dana, 1853: 878, pl. 59, fig. 6a���m.��� Lowry & Stoddart, 2003: 273.��� Lowry & Springthorpe, 2009a: 902. Orchestia gammarellus.��� Stebbing, 1906: 532 (in part). Vallorchestia dispar.��� Lowry, 2012: 20, figs 11���14. Types. Neotype, male, 14 mm, AM P.85737, Type locality. North of lagoon, Valla Beach, New South Wales, Australia (30��35���S 153��00���E), Ecological type. Beach-hopper. Habitat. Marine, supralittoral beach-hopper (mascupod), under leaves and debris. Size. Male, 14 mm. Diagnosis ( male ). Based on Lowry (2012). With characters of the genus. Distribution. Australia. New South Wales: shores of Illawarra (Dana 1852); Valla Beach (Lowry 2012); Macleay River (Lowry 2012); Smiths Lake (Lowry 2012)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 43-45, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Dana, J. D. (1852) Conspectus crustaceorum quae in orbis terrarum circumnavigatione, CAROLO WILKES e classe Reipublicae Faederatae Duce, lexit et descripsit JACOBUS D. DANA Pars III. [Amphipoda. No. 1.]. Proceedings of the American Academy of Arts and Sciences, 2, 201 - 220.","Dana, J. D. (1853) Crustacea, Part II. United States Exploring Expedition during the years 1838, 1839, 1840, 1841, 1842, under the command of Charles Wilkes, U. S. N., 14, 686 - 1618.","Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. In: Zoological Catalogue of Australia. 19.2 (B). CSIRO Publishing, Melbourne), pp. i - xii + 1 - 532.","Lowry, J. K. & Springthorpe, R. T. (2009 a) Talorchestia brucei sp. nov. (Amphipoda, Talitridae), the first talitrid from the Northern Territory, Australia. Crustaceana, 82 (7), 897 - 912. https: // doi. org / 10.1163 / 156854009 X 427423","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, i - xxxix + 1 - 806.","Lowry, J. K. (2012) Talitrid amphipods of ocean beaches in New South Wales, Australia (Amphipoda, Talitridae). Zootaxa, 3575 (1), 1 - 26. https: // doi. org / 10.11646 / zootaxa. 3575.1.1"]}

Yamatorchestia nudiramus (Morino & Miyamoto, 2015) (Fig. 25) ��� Parorchestia ��� sp. 2 Miyamoto, 1982: 94 ��� Parorchestia ��� sp. 3 Morino, 1999, 640, Fig. 1, 644. Nipponorchestia nudiramus Morino & Miyamoto, 2015: 9, figs 6, 7.��� Tomikawa, 2017: 254, table 1. Yamatorchestia nudiramus Takahashi & Morino, 2021: 12. Types. Holotype, male, 7.4 mm, NSMT-Cr 23754. Paratypes: female, 7.7 mm, NSMT-Cr 23755; 7 males, 5 females, 39 juveniles, NSMT-Cr 23756; 1 female, 9.2 mm, NSMT-Cr 23762. Type locality. Ashu, Research Forest, Kyoto University, Kyoto, Japan. Ecological type. Forest-hopper. Habitat. Living in Aesculus turbinata forest, in Cryptomeria forests at 420 m altitude and in Acer, Fagus crenata and Quercus crispula forests. Size. Male, 7.4���8.2 mm, female, 7.7���9.2 mm. Diagnosis ( male ). With the characters of the genus. Distribution. Japan. Central Honshu (Morino & Miyamoto 2015)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 46-47, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Morino, H. & Miyamoto, H. (2015) A new land-hopper genus, Nipponorchestia with two new species from Japan (Crustacea, Amphipoda, Talitridae). Bulletin of the National Museum of Nature and Science, Series A, 41 (1), 1 - 13.","Miyamoto, H. (1982) Land-hoppers (Talitridae, Amphipoda, Crustacea) in the catchment area of Mana River, Hokuriku District, Japan. In: Biological Society of Fukui Prefectural High Schools (Ed.), Biological Research of the Catchment Area of Mana River, 1982, pp. 94 - 98. [in Japanese]","Morino H. (1999) Amphipoda. In: Aoki, J. (Ed.), Pictorial Keys to Soil Animals of Japan. Tokai University Press, Tokyo, 626 - 644. [in Japanese]","Tomikawa, K. (2017) Species Diversity and Phylogeny of Freshwater and Terrestrial Gammaridean Amphipods (Crustacea) in Japan. In: Motokawa, M. & Kajihara, H. (Eds.), Species Diversity of Animals in Japan. Diversity and Commonality in Animals. Springer, Tokyo, pp. 249 - 267. https: // doi. org / 10.1007 / 978 - 4 - 431 - 56432 - 4 _ 9","Takahashi, T., Morino, H., Tomikawa, K., Lai, Y. - T. & Takafumi, N. (2021) Molecular phylogenetic position of Minamitalitrus zoltani elucidates a further troglobisation pattern in cave-dwelling terrestrial amphipods (Crustacea: Talitridae). Molecular Phylogenetics and Evolution, 154 (106984), 1 - 6 https: // doi. org / 10.1016 / j. ympev. 2020.106984"]}

Demaorchestia gen. nov. Type species. Platorchestia. parapacifica Kim, Jung & Min, 2013. Included species. Demaorchestia contains 5 species: Demaorchestia hatakejima sp. nov.; D. joi (Stock & Biernbaum, 1994) comb. nov.; D. mie sp. nov.; D. parapacifica (Kim, Jung & Min, 2013) comb. nov.; D. pseudojoi sp. nov.. Ecological type. Beach-hoppers or Marsh-hoppers. Habitat. Sandy beaches, often around river mouths. Etymology. Demao is the type locality of D. pseudojoi plus stem Orchestia. Diagnostic description ( male ). Based on Kim & Kim (1987) and Miyamoto & Morino (2004). Head. Antenna 2 peduncular articles incrassate; article 3 without ventral process. Mandible left lacinia mobilis 5-cuspidate. Labium with or without inner lobes, with possible vestigial inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 4 groups of robust setae, ���subtriangular��� with welldeveloped posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute, rounded distally, irregular or sigmoidal, with small mid-palmar sinus, without large distal sinus; dactylus not modified distally, blunt. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin or short with mini-wavy posterior margin. Pereopod 6 subequal in length to pereopod 7 or slightly shorter; not incrassate, male merus and or carpus expanded; basis moderately expanded; male merus and carpus not expanded or male merus expanded, carpus not expanded. Pereopod 7 incrassate or not; basis broadly expanded; posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, broadly rounded; merus unexpanded or merus expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded or expanded, subrectangular, shorter than or subequal to propodus; propodus broad or slender; length 5.8���7.2 �� width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods 1���3 all well-developed. Uropod 1 peduncle distolateral robust seta present or absent; exopod without marginal robust setae; endopod with marginal robust setae in 2 rows. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus subequal to or shorter than peduncle. Telson apically incised, with 7���11 robust setae per lobe. Remarks. Demaorchestia is one of several genera having an incrassate second antenna. Within this group it is most similar to Platorchestia. It differs in having a simplidactylate gnathopod 1. Demaorchestia differs from Cocorchestia in having a distally rounded acute palm on the second gnathopod, never with a large distal sinus and the endopod of the uropods with two rows of marginal setae. Distribution. Russia, Korea, Japan, Taiwan (Gurjanova 1951, Jo 1988, Kim & Kim 1987, Miyamoto & Morino 2004)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 11, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Kim, M. - S., Jung, J. - H. & Min, G. - S. (2013) A new beach-hopper, Platorchestia parapacifica n. sp. (Amphipoda: Talitridae), from South Korea, with molecular phylogeny of the genus Platorchestia. Journal of Crustacean Biology, 33, 828 - 842. https: // doi. org / 10.1163 / 1937240 X- 00002186","Stock, J. H. & Biernbaum, C. K. (1994) Terrestrial Amphipoda (Talitridae) from Ascension and Saint Helena (South Central Atlantic). Journal of Natural History, 28, 795 - 811. https: // doi. org / 10.1080 / 00222939400770411","Kim, H. - S. & Kim, C. B. (1987) Marine gammaridean Amphipoda (Crustacea) of Cheju Island and its adjacent waters, Korea. Korean Journal of Systematic Zoology, 3 (1), 1 - 23.","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Gurjanova, E. F. (1951) Bokoplavy morej SSSR i sopredel'nykh vod (Amphipoda-Gammaridea). Akademiia Nauk SSSR, Opredeliteli po Faune SSSR, 41, 1 - 1029, 705 figs. [in Russian]","Jo, Y. W. (1988) Talitridae (Crustacea - Amphipoda) of the Korean coasts. Beaufortia, 38 (7), 153 - 179."]}

Miyamotoia daitoensis Morino, 2020 (Fig. 16) Miyamotoia daitoensis Morino, 2020: 8, figs 6, 7. Types. Holotype (NSMT-Cr 26792) ovigerous female 11.0 mm; near the mouth of Hoshino-Do cave, Minami-Daitojima Island, Okinawa. Paratypes, 1 male 7.6 mm (NSMT-Cr 26793), 1 female 9.2 mm (NSMT-Cr 26794), 1 male 7.6 mm, (NSMT-Cr 26795); data as holotype. Type locality. Near the mouth of Hoshino-Do cave, Minami-Daitojima Island, Okinawa, Japan. Ecological type. Forest-hopper. Habitat. 40 m altitude, living among the magnolia Machilus thunbergii, the cinnamon Cinnamomum yabunikkei and Schefflera heptaphylla. Size. Male, 7.6 ��� 9.2 mm, female, 11 mm. Diagnosis ( male ). Based on Morino (2020). Labrum without robust setae along anterior margin. Gnathopod 2 dactylus short, recurved distally. Pereopod 4 thickened proximally with notch midway along posterior margin. Uropod 1 peduncle distolateral robust seta present. Uropod 3 ramus shorter than peduncle. Remarks. In M. daitoensis the labrum lacks robust setae (present in M. spinolabrum) and the pleopodal rami are about 0.3 �� as long as peduncles (0.5 �� as long in M. spinolabrum). Distribution. Japan. Okinawa: Minami-Daitojima Island (Morino 2020)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 31, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Morino, H. (2020) The Description of Two New Genera and Four New Species of the Terrestrial Talitridae (Crustacea, Amphipoda) from the Ogasawara and Daito Islands, Southern Japan. Bulletin of the National Museum of Natural Science, Series A, 46 (1), 1 - 23."]}

Platorchestia Bousfield, 1982 Platorchestia Bousfield, 1982: 26.��� Jo, 1988: 160.��� Richardson, 1991: 186.��� Morino & Ortal, 1995: 825.��� Miyamoto & Morino, 2004: 68. Type species. Orchestia platensis Kr��yer, 1845, original designation. Currently* included species: P. ano Lowry & Bopiah, 2013; P. crassicornis (Costa, 1867), not P. crassicornis (Derzhavin, 1937) = Demaorchestia joi (Stock & Biernbaum, 1994) com. nov.; P. munmui Jo, 1988; P. pachypus (Derzhavin, 1937); P. pacifica Miyamoto & Morino, 2004; P. paraplatensis Serejo & Lowry, 2008; P. platensis (Kr��yer, 1845); P. smithi Lowry, 2012. Ecological type. Beach-hopper. Habitat. Among stranded algae and beach detritus on marine shores. Size. 8���15 mm, Remarks. Platorchestia is very similar to the north-western Pacific genus Sinorchestia. They differ mainly in the ventral plate on antenna 2 peduncular article 3 (absent in Platorchestia); in the fourth article of the maxillipedal palp (reduced, button-shaped in Platorchestia, absent in Sinorchestia); and in gnathopod 1 (subchelate in Platorchestia, parachelate in Sinorchestia). Species inquirenda. Platorchestia chathamensis Bousfield, 1982 (based on a female). * A generic revision is currently in preparation by AAM and JKL, Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 39, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Bousfield, E. L. (1982) The amphipod superfamily Talitroidea in the northeastern Pacific region. Family Talitridae. Systematics and distributional ecology. National. Museum of Natural Science, Publications in Biological Oceanography, 11, i - vii + 1 - 73.","Jo, Y. W. (1988) Talitridae (Crustacea - Amphipoda) of the Korean coasts. Beaufortia, 38 (7), 153 - 179.","Richardson, A. M. M. (1991) Two new species of landhoppers (Crustacea: Talitridae) from O'ahu, Hawaiian Islands, with redescription of Platorchestia pickering i and key to landhoppers of O'ahu. Bishop Museum Occasional Papers, 31, 185 - 201.","Morino, H. & Ortal, R. (1995) Two Platorchestia species (Amphipoda, Talitridae) from Israel. Crustaceana, 68, 824 - 832. https: // doi. org / 10.1163 / 156854095 X 00971","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Kroyer, H. (1845) Karcinologiske bidrag. Naturhistorisk tidsskrift, N. R., l, 283 - 345, pls. 2 + 3, 403 + 453 - 638, pls. 6 + 7.","Lowry, J. K. & Bopiah, A. (2013) The talitrid amphipods of Tonga (Crustacea, Amphipoda, Talitridae). Zootaxa, 3681 (4), 347 - 370. https: // doi. org / 10.11646 / zootaxa. 3681.4.2","Costa, A. (1867) Saggio della collezione di Crostacei del Mediterraneo del Museo zoologico della Universita di Napoli spedito alla Esposizione di Parigi del 1867. Annuario del Museo zoologico della R. Universitd di Napoli, 4, 38 - 46, pl. 3, fig. 1 - 2.","Derzhavin, A. N. (1937) Talitridae of the Soviet Coast of the Japan Sea. Issledovaniya Fauny Morej SSSR, 23, 87 - 112. [in Russian with English summary]","Stock, J. H. & Biernbaum, C. K. (1994) Terrestrial Amphipoda (Talitridae) from Ascension and Saint Helena (South Central Atlantic). Journal of Natural History, 28, 795 - 811. https: // doi. org / 10.1080 / 00222939400770411","Serejo, C. S. & Lowry, J. K. (2008) The coastal Talitridae (Amphipoda, Talitroidea) of Southern and Western Australia with Comments on Platorchestia platensis (Kroyer, 1845). Records of the Australian Museum, 60 (2 / 3), 161 - 206. https: // doi. org / 10.3853 / j. 0067 - 1975.60.2008.1491","Lowry, J. K. (2012) Talitrid amphipods of ocean beaches in New South Wales, Australia (Amphipoda, Talitridae). Zootaxa, 3575 (1), 1 - 26. https: // doi. org / 10.11646 / zootaxa. 3575.1.1"]}

Yamatorchestia Takahashi & Morino, 2021 Nipponorchestia Morino & Miyamoto, 2015: 2 (in part). Yamatorchestia Takahashi & Morino, 2021:11. Type species. Nipponorchestia nudiramus Morino & Miyamoto, 2015, original designation. Type locality. Ashu, Research Forest (Kyoto University), Kyoto, Japan. Included species. Yamatorchestia includes 1 species: Y. nudiramus (Morino & Miyamoto, 2015). Category. Mascupod. Ecological type. Forest-hoppers (non-substrate-modifying talitrids). Habitat. Terrestrial, from under litter or moist soils of coastal habitats including grasslands and forests, occasionally from near supralittoral zones. Size. Male, 7.4 mm, female, 7.7 mm. Diagnostic description ( male ). Based on Morino & Miyamoto (2015) and Takahashi & Morino (2021). Head. Antenna 1 short, not reaching midpoint of antenna 2 peduncular article 5; flagellum with 4 articles, geniculated between articles 2 and 3, article 3 longest. Antenna 2 peduncular articles slender ; article 3 without plate or process ventrally. Mandible left lacinia mobilis 4-cuspidate . Labium without inner lobes, or with possible vestigial inner lobes. Maxilliped palp slender ; article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa slightly smaller than coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 2 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus apparently simplidactylate. Gnathopod 2 subchelate; propodus palm acute; propodus palm evenly rounded; without palmar sinuses; without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus slightly curved, longer than palm, recurved distally. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus similar in length to that of pereopod 3; dactylus amplidactylate (weakly pinched), similar to pereopod 3 dactylus, not thickened proximally or notched. Pereopod 6 subequal in length to pereopod 7, not incrassate; distally; coxal gill of pereopod 6 with leaf-shaped lobe; basis moderately expanded; male merus and carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin smooth or minutely serrate margin with numerous small slender setae, posterodistal lobe produced downwards almost to merus, triangular, produced downwards almost to merus; merus unexpanded; carpus unexpanded; subrectangular; carpus shorter than propodus; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all reduced . Epimeral plates without slits. Uropod 1 peduncle distolateral robust seta present; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 1 row. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 2 robust setae per lobe. Remarks. Yamatorchestia is the only platorchestiine with only 2 robust setae per lobe on the telson. Based on the slender second antenna, pereopod 4 dactylus unmodified, similar to that of pereopod 3 and reduced pleopods Yamatorchestia is similar to the Hawaiian terrestrial genera Laniporchestia and Pickorchestia. It shares a gnathopod 2 palm with no sinuses with Laniporchestia, but differs in the gnathopod 2 dactylus which is short and recurved (attenuated in Laniporchestia). Yamatorchestia differs from Pickorchestia in having no sinuses on the palm of gnathopod 2, and in having a short recurved dactylus (not modified, blunt in Pickorchestia). Distribution. Japan. Central and south-west Honshu., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 45, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Takahashi, T., Morino, H., Tomikawa, K., Lai, Y. - T. & Takafumi, N. (2021) Molecular phylogenetic position of Minamitalitrus zoltani elucidates a further troglobisation pattern in cave-dwelling terrestrial amphipods (Crustacea: Talitridae). Molecular Phylogenetics and Evolution, 154 (106984), 1 - 6 https: // doi. org / 10.1016 / j. ympev. 2020.106984","Morino, H. & Miyamoto, H. (2015) A new land-hopper genus, Nipponorchestia with two new species from Japan (Crustacea, Amphipoda, Talitridae). Bulletin of the National Museum of Nature and Science, Series A, 41 (1), 1 - 13."]}

Miyamotoia Morino, 2020 Miyamotoia Morino, 2020: 2. Type species. Miyamotoia spinolabrum Morino, 2020, original designation. Included species. Miyamotoia contains 2 species: M. daitoensis Morino, 2020; M. spinolabrum Morino, 2020. Category. Mascupod. Ecological type. Forest-hopper. Habitat. Humid forests. Diagnostic description ( male ). Based on Morino (2020). Head. Antenna 2 peduncular articles slender . Mandible left lacinia mobilis 5-cuspidate. Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa slightly smaller than coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 or with 4 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute; propodus palm evenly rounded, without palmar sinuses; without proximal spine or thumb defining palm, without large projection near dactylar hinge; dactylus short, recurved distally or attenuated distally (short). Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin or short with mini-wavy posterior margin. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus and carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, narrowly rounded; merus unexpanded; carpus unexpanded; propodus broad, 6.1 �� width, without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all reduced . Uropod 1 peduncle distolateral robust seta present or absent; exopod without marginal robust setae; endopod with marginal robust setae in 2 rows. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 3 to at least 10 robust setae per lobe. Remarks. Miyamotoia is similar to Laniporchestia from Hawaii. See remarks under Laniporchestia. Miyamotoia is also similar to Tethorchestia. The main differences are gnathopod 1 dactylus is simplidactylate (cuspidactylate in Tethorchestia), pereopod 7 propodus without a large, distal tuft of setae (present in Tethorchestia), uropod 1 peduncle without a distolateral robust seta (present in Tethorchestia) and the endopod of uropod 1 with marginal setae in two rows (one row in Tethorchestia). Distribution. Japan: Ogasawara Islands and Daitojima Islands, Southern Japan (Morino 2020)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 29-30, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Morino, H. (2020) The Description of Two New Genera and Four New Species of the Terrestrial Talitridae (Crustacea, Amphipoda) from the Ogasawara and Daito Islands, Southern Japan. Bulletin of the National Museum of Natural Science, Series A, 46 (1), 1 - 23."]}

Insularorchestia gen. nov. Type species. Orchestia ashmoleorum Stock, 1996, current designation. Included species. Insularorchestia includes 3 species: I. ashmoleorum (Stock, 1996) com. nov.; I. monodi (Mateus, Mateus & Afonso, 1986) com. nov. and I. susorum sp. nov. of Stock & Biernbaum, 1994 com. nov.. Ecological type. Beach-hoppers, field-hoppers. Habitat. Sand beaches and under stones at 762 m altitude (Stock & Biernbaum 1994). Etymology. From islands. Diagnostic description ( male ). Based on Mateus, Mateus & Afonso (1986), Stock (1996), Serejo (2004), Morino & Ortal (1995) and Stock & Biernbaum (1994). Head. Antenna 2 peduncular articles incrassate . Mandible left lacinia mobilis 5- or 6-cuspidate. Labium without inner lobes, with possible vestigial inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped or fused with article 3. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 or 4 groups of robust setae, subrectangular or ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute, evenly rounded or irregular with small to large shallow midpalmar sinus or without distal palmar sinus; with or without proximal spine or thumb defining palm; dactylus not modified distally, blunt or short, recurved distally or attenuated distally. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3 or subequal or slightly shorter than pereopod 3; carpus similar in length to that of pereopod 3 or significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin or short, thickened. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus and carpus not expanded or male merus expanded, carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present or posterodistal lobe absent, shallow, broadly rounded; merus expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded or expanded, subrectangular, subequal to or shorter than propodus; propodus broad or propodus slender; length 4.7���7.3 �� width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods 1���3 all well-developed. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 2 rows. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus subequal in length to peduncle, or shorter than peduncle. Telson apically incised, with 3���6 robust setae per lobe. Remarks. Insularorchestia is most similar to Platorchestia. It differs in having a simplidactylate gnathopod 1 (cuspidactylate in Platorchestia). Distribution. South Atlantic Ocean. Saint Helena (Stock 1996); Ascension Island (Stock & Biernbaum 1994). North Atlantic Ocean. Azores (Mateus, Mateus & Afonso 1986)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 17-19, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stock, J. H. (1996) The genus Platorchestia (Crustacea, Amphipoda) on the Mid-Atlantic islands, with description of a new species from Saint Helena. Miscellania Zoologica, 19 (1), 149 - 157.","Stock, J. H. & Biernbaum, C. K. (1994) Terrestrial Amphipoda (Talitridae) from Ascension and Saint Helena (South Central Atlantic). Journal of Natural History, 28, 795 - 811. https: // doi. org / 10.1080 / 00222939400770411","Serejo, C. S. (2004) Talitridae (Amphipoda, Gammaridea) from the Brazilian coastline. Zootaxa, 646 (1), 1 - 29. https: // doi. org / 10.11646 / zootaxa. 646.1.1","Morino, H. & Ortal, R. (1995) Two Platorchestia species (Amphipoda, Talitridae) from Israel. Crustaceana, 68, 824 - 832. https: // doi. org / 10.1163 / 156854095 X 00971","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317"]}

Chroestia lota Marsden & Fenwick, 1984 (Fig. 2) Chroestia lota Marsden & Fenwick, 1984: 844, figs 1���4.��� Springthorpe & Lowry, 1994: 23.��� Lowry & Stoddart, 2003: 271.��� Serejo & Lowry, 2008: 162.��� Lowry & Springthorpe, 2009a: 899.��� Serejo, 2009: 892. Non-Taxonomic Citations Chroestia lota.��� Marsden, 1985: 213, 216, table 1, 217, fig. 1, 218, table 2, 219, fig. 2, table 3 (oxygen uptake). Types. Holotype, female, 9.1mm, AM P.34316. Paratypes: male, 12.9 mm, AM P.34317; 28 paratypes, AM P.34319; 13 paratypes, NMV J7105; 19 paratypes, NMNZ Cr3206; 6 paratypes, AM P.34318. Type locality. Lota, Moreton Bay, Queensland, Australia. Ecological type. Beach-hopper. Habitat. Marine beach-hopper (mascupod). Supralittoral beaches, among Zostera debris, upper littoral, on sand and gravel beach. Size. Male, 12.9 mm, female, 9.1 mm. Diagnosis ( male ). Based on Marsden & Fenwick (1984). Gnathopod 1 propodus palm sinuous, with shallow proximal sinus. Telson without 1 or 2 very long robust setae on dorsal margin. Distribution. Australia. Queensland: Lota, Moreton Bay (Marsden & Fenwick, 1984)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 6-7, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Marsden, I. D. & Fenwick, G. D. (1984) Chroestia, a new supralittoral amphipod genus from Queensland, Australia (Talitroidea: Talitridae). Journal of Natural History, London, 18, 843 - 851. https: // doi. org / 10.1080 / 00222938400770731","Springthorpe, R. T. & Lowry, J. K. (1994) Catalogue of crustacean type specimens in the Australian Museum, Malacostraca. Technical Reports of the Australian Museum, 11, 1 - 134. https: // doi. org / 10.3853 / j. 1031 - 8062.11.1994.68","Lowry, J. K. & Stoddart, H. E. (2003) Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. In: Zoological Catalogue of Australia. 19.2 (B). CSIRO Publishing, Melbourne), pp. i - xii + 1 - 532.","Serejo, C. S. & Lowry, J. K. (2008) The coastal Talitridae (Amphipoda, Talitroidea) of Southern and Western Australia with Comments on Platorchestia platensis (Kroyer, 1845). Records of the Australian Museum, 60 (2 / 3), 161 - 206. https: // doi. org / 10.3853 / j. 0067 - 1975.60.2008.1491","Lowry, J. K. & Springthorpe, R. T. (2009 a) Talorchestia brucei sp. nov. (Amphipoda, Talitridae), the first talitrid from the Northern Territory, Australia. Crustaceana, 82 (7), 897 - 912. https: // doi. org / 10.1163 / 156854009 X 427423","Serejo, C. S. (2009) Talitridae. In: Lowry, J. K. & Myers, A. A. (Eds.), Amphipoda of the Great Barrier Reef, Australia. Zootaxa, 2260 (1), pp. 892 - 903. https: // doi. org / 10.11646 / zootaxa. 2260.1.51","Marsden, I. D. (1985) Some factors affecting survival and oxygen uptake in a subtropical beach flea. Journal of Experimental Marine Biology and Ecology, 88, 243 - 255. https: // doi. org / 10.1016 / 0022 - 0981 (85) 90231 - X"]}

Laniporchestia Lowry & Myers, 2019 Platorchestia Bousfield, 1982: 26 (in part.) Platorchestia group 3 of Miyamoto & Morino, 2004: 69. Laniporchestia Lowry & Myers, 2019: 53, fig. 23. Type species. Platorchestia lanipo Richardson, 1991, monotypy. Included species. Laniporchestia contains 1 species: L. lanipo (Richardson, 1991). Ecological type. Tree/moss-hopper. Diagnostic description ( male ). Based on Richardson (1991). Head. Antenna 2 peduncular articles slender or slightly incrassate (?). Mandible left lacinia mobilis 5-cuspidate. Labium without inner lobes. Maxilliped palp slender; article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 2 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus dactylation unknown. Gnathopod 2 subchelate; propodus palm acute, without palmar sinuses; without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus slightly curved, longer than palm, attenuated distally. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus similar in length to that of pereopod 3; dactylus homobasidactylate, similar to pereopod 3 dactylus, not thickened proximally or notched. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus expanded, carpus slightly or not expanded. Pereopod 7 not incrassate ; basis broadly expanded, posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, broadly rounded; merus and carpus unexpanded, subrectangular; carpus shorter than propodus; propodus slender, length 8 �� width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all slightly reduced, rami not articulated, shorter than peduncles. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 1 row. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 4 robust setae per lobe. Remarks. Laniporchestia is similar to the Japanese genus Morinoia. It differs from Morinoia Lowry & Myers, 2019 as follows: maxillipedal palp slender (broad in Morinoia); telson rounded distally (tapering distally in Morinoia). Distribution. Hawaii. Oahu (Richardson 1991)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 23, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Bousfield, E. L. (1982) The amphipod superfamily Talitroidea in the northeastern Pacific region. Family Talitridae. Systematics and distributional ecology. National. Museum of Natural Science, Publications in Biological Oceanography, 11, i - vii + 1 - 73.","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Richardson, A. M. M. (1991) Two new species of landhoppers (Crustacea: Talitridae) from O'ahu, Hawaiian Islands, with redescription of Platorchestia pickering i and key to landhoppers of O'ahu. Bishop Museum Occasional Papers, 31, 185 - 201."]}

Vallorchestia Lowry, 2012 Vallorchestia Lowry, 2012: 19, figs 11���14. Type species. Orchestia dispar Dana, 1852, monotypy. Included species. Vallorchestia includes 1 species: V. dispar (Dana, 1852). Category. Mascupod. Ecological type. Beach-hoppers. Habitat. Sand beaches, living under Zostera, leaves and debris in the supralittoral. Diagnostic description ( male ). Based on Lowry (2012). Head. Antenna 2 peduncular articles slightly incrassate. Mandible left lacinia mobilis 4-cuspidate. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae (merus vestigial); propodus anterior margin with 3 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute; without sinuses; without proximal spine or thumb defining palm; dactylus attenuated distally. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3; carpus similar in length to that of pereopod 3; dactylus homobasidactylate, similar to pereopod 3 dactylus, not thickened proximally or notched. Pereopod 6 incrassate (merus and carpus with T-setae) ; basis expanded; male merus and carpus not expanded. Pereopod 7 incrassate; basis expanded; merus expanded distally, subtriangular, anterior margin straight; carpus expanded, subrectangular; carpus shorter than propodus; propodus slender; length 7.7 �� width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods 1���3 all well-developed . Uropod 1 peduncle distolateral robust seta present; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 7���9 robust setae per lobe. Remarks. Vallorchestia shares homoplasies with Mexorchestia from Central America and Miyamotoia from Japan. It is distinguished from other platorchestiines by the autoapomorphic setae on the male pereopod 6. Distribution. Australia: New South Wales (Lowry 2012)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 43, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Lowry, J. K. (2012) Talitrid amphipods of ocean beaches in New South Wales, Australia (Amphipoda, Talitridae). Zootaxa, 3575 (1), 1 - 26. https: // doi. org / 10.11646 / zootaxa. 3575.1.1","Dana, J. D. (1852) Conspectus crustaceorum quae in orbis terrarum circumnavigatione, CAROLO WILKES e classe Reipublicae Faederatae Duce, lexit et descripsit JACOBUS D. DANA Pars III. [Amphipoda. No. 1.]. Proceedings of the American Academy of Arts and Sciences, 2, 201 - 220."]}

Demaorchestia joi (Stock & Biernbaum, 1994) com. nov. (Fig. 6) Talorchestia crassicornis Derzhavin, 1937: 108, pl. 3, 1. [homonym of Platorchestia crassicornis (Costa, 1867)].��� Gurjanova, 1951: 812, fig. 566. Orchestia platensis.���? Iwasa, 1939: 257, figs 1���3, pl. IX.��� Bulycheva, 1957: 159���162, figs 57a���b. ? Talorchestia crassicornis.��� Kussakin, 1975: 66, table 1 (species list).). Platorchestia crassicornis.��� Bousfield, 1982: 26.��� Jo, 1988: 161, figs 5���7, 9a, c, e, 10d, e [D. joi comb. nov.]. not Platorchestia crassicornis (Costa 1867). Platorchestia joi Stock & Biernbaum, 1994: 800 (replacement name for P. crassicornis (Derzhavin, 1937), junior homonym of P. crassicornis (Costa, 1867)).��� Stock, 1996: 156.��� Serejo, 2004: 20, table 2. ? Platorchestia crassicornis.��� Ryu et al., 2012: 716, table 4, 719, 726, appendix 1 (checklist). ? Platorchestia platensis.?��� Kim & Kim, 1987: 18, 19, fig. 16A���G. Not Platorchestia joi.��� Miyamoto & Morino, 2004: 69, key, 70, figs 1���3, 15 (= D. pseudojoi sp. nov.). Non-Taxonomic Citations Platorchestia crassicornis.��� Kim & Kim, 1993: 946, appendix 1 (phylogeny).��� Tsubokura, Kikuchi & Nakao, 1998: 626, 627, table 1, fig. 2, 628, 629, 630, fig. 4, 631, fig. 5, table 2, 632, fig. 6, table 3, 633, table 4, 636, fig. 11c (gill morphology).��� Hong & Yoon, 2000: 151, fig. 7, 152, fig. 8, 153, fig. 9, 154, table 1, appendix (ecology).��� Nanami et al., 2005: 169, table 1 (ecology).��� Lisitsyna, 2011: e-7 (intermediate host). Platorchestia joi.��� Wildish & Radulovici, 2019: 2415, table 1, 2422, table 4, 2426, table 6 (zoogeography). Types. None selected. Type locality. Posyet Bay, Peter the Great Gulf, Russia; Bay of Castries, Coast of Tartary, Russia; Suifin River, Amur Bay and Gulf of Transfiguration, Sea of Japan. Ecological type. Beach-hoppers or marsh-hoppers. Habitat. Sandy beaches. Size. Male, 12.5 mm. Diagnosis. Based on Jo (1988). Labium with vestigial inner lobes. Pereopod 4 dactylus, thickened proximally with notch midway along posterior margin. Epimeron 3 posterior margin minutely serrate. Remarks. Demaorchestia joi and D. pseudojoi are very similar. They differ as follows: labium with vestigial inner lobes (absent in D. pseudojoi); gnathopod 1 carpus length more than 2 �� width (less than 2 �� width in D. pseudojoi); pereopod 4 dactylus thickened proximally with notch halfway along posterior margin (dactylus short with mini-wavy posterior margin in D. pseudojoi). Distribution. Russia. Posyet Bay, Patroclus Bay, Chikhachyova Bay (as de Castries Bay), (Derzhavin 1937). Korea, Japan (Kim & Kim 1987 and Jo 1988)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 13, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stock, J. H. & Biernbaum, C. K. (1994) Terrestrial Amphipoda (Talitridae) from Ascension and Saint Helena (South Central Atlantic). Journal of Natural History, 28, 795 - 811. https: // doi. org / 10.1080 / 00222939400770411","Derzhavin, A. N. (1937) Talitridae of the Soviet Coast of the Japan Sea. Issledovaniya Fauny Morej SSSR, 23, 87 - 112. [in Russian with English summary]","Costa, A. (1867) Saggio della collezione di Crostacei del Mediterraneo del Museo zoologico della Universita di Napoli spedito alla Esposizione di Parigi del 1867. Annuario del Museo zoologico della R. Universitd di Napoli, 4, 38 - 46, pl. 3, fig. 1 - 2.","Gurjanova, E. F. (1951) Bokoplavy morej SSSR i sopredel'nykh vod (Amphipoda-Gammaridea). Akademiia Nauk SSSR, Opredeliteli po Faune SSSR, 41, 1 - 1029, 705 figs. [in Russian]","Iwasa, M. (1939) Japanese Talitridae. Journal of the Faculty of Science, Hokkaido Imperial University, series 6, Zoology, 6 (4), 255 - 296, pls. 9 - 18.","Bulycheva, A. I. (1957) Sea fleas of the seas of the USSR and adjacent waters (Amphipoda-Talitroidea) Opredeliteli po faune SSSR, 65, 1 - 186, 66 figs., 4 maps. [in Russian]","Kussakin, O. G. (1975) A list of the macrofauna in the intertidal zone of The Kurile Islands, with remarks on zoogeo-graphical structure of the region. Publications of the Seto Marine Biological Laboratory, 22 (1 - 4), 47 - 74. [http: // hdl. handle. net / 2433 / 175890] https: // doi. org / 10.5134 / 175890","Bousfield, E. L. (1982) The amphipod superfamily Talitroidea in the northeastern Pacific region. Family Talitridae. Systematics and distributional ecology. National. Museum of Natural Science, Publications in Biological Oceanography, 11, i - vii + 1 - 73.","Jo, Y. W. (1988) Talitridae (Crustacea - Amphipoda) of the Korean coasts. Beaufortia, 38 (7), 153 - 179.","Stock, J. H. (1996) The genus Platorchestia (Crustacea, Amphipoda) on the Mid-Atlantic islands, with description of a new species from Saint Helena. Miscellania Zoologica, 19 (1), 149 - 157.","Serejo, C. S. (2004) Talitridae (Amphipoda, Gammaridea) from the Brazilian coastline. Zootaxa, 646 (1), 1 - 29. https: // doi. org / 10.11646 / zootaxa. 646.1.1","Ryu, S. - H., Jang, K. - H., Choi, E. - H., Kim, S. - K., Song, S. - J., Cho, H. - J., Ryu, J. - S., Kim, Y. - M., Sagong, J., Le, J. - H., Yeo, M. - Y., Bahn, S. - Y., Kim, H. - M., Le, G. - S., Le, D. - H., Choo, Y. - S., Pak, J. - H., Park, J. - S., Ryu, J. - S., Khim, J. - S. & Hwang, U. - W. (2012) Biodiversity of Marine Invertebrates on Rocky Shores of Dokdo, Korea. Zoological Studies, 51 (5), 710 - 726.","Kim, H. - S. & Kim, C. B. (1987) Marine gammaridean Amphipoda (Crustacea) of Cheju Island and its adjacent waters, Korea. Korean Journal of Systematic Zoology, 3 (1), 1 - 23.","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Kim, C. B. & Kim, W. (1993) Phylogenetic relationships among gammaridean families and amphipod suborders, Journal of Natural History, 27 (4), 933 - 946. https: // doi. org / 10.1080 / 00222939300770571","Tsubokura, T., Kikuchi, S. & Nakao, S. (1998) Distribution pattern, gill area relationships, and fine structural characteristics of the gill epithelia in supralittoral and terrestrial talitrid amphipods. Journal of Crustacean Biology, 18 (4), 625 - 642. https: // doi. org / 10.2307 / 1549137","Hong, J. & Yoon, S, (2000) Zonation of the exposed sandy beach macrofaun in Ojkukpo, Techongdo, Korea. Journal of the Korean Society of Oceanography, 5 (2), 146 - 156. [in Korean]","Nanami, A., Saito, H., Akita, T., Motomatsu, K. & Kuwahara, H. (2005) Spatial distribution and assemblage structure of macrobenthic invertebrates in a brackish lake in relation to environmental variables. Estuarine, Coastal and Shelf Science, 63 (1 - 2), 167 - 176. https: // doi. org / 10.1016 / j. ecss. 2004.11.004","Lisitsyna, O. I. (2011) First findings of acanthocephalans Arhythmorhynchus invaginabilis, Southwellina hispida (Acanthocephales, Polymorphidae) Plagiorhynchus (Plagiorhynchus) odhneri (Acanthocephales, Plagiorhynchidae) in the intermediate hosts. Vestnik zoologii, 45 (4), e- 1 - e- 8. https: // doi. org / 10.2478 / v 10058 - 011 - 0019 - 0","Wildish, D. J. & Radulovici, A. E. (2019) Zoogeography and evolutionary ecology of the genus Platorchestia (Crustacea, Amphipoda, Talitridae). Journal of Natural History, 53 (39 - 40), 2413 - 2435. https: // doi. org / 10.1080 / 00222933.2019.1704463"]}

Morinoia Lowry & Myers, 2019 Platorchestia Bousfield, 1982: 26 (in part.) Platorchestia group 3 of Miyamoto & Morino, 2004: 69 (in part). Morinoia Lowry & Myers, 2019: 61, fig. 27. Type species. Platorchestia paludosus Cheng, Nakazono, Lin & Chan, 2011, original designation. Included species. Morinoia contains 3 species: M. humicola (Martens, 1868); M. japonica (Tattersall, 1922); M. paludosus (Cheng, Nakazono, Lin & Chan, 2011). Ecological type. Field-hopper, riparian-hopper and marsh-hopper. Habitat. Marshes, under fallen leaves and grass in coastal areas. Diagnostic description ( male ). Based on Cheng et al. (2011), Miyamoto & Morino (2004), Morino & Dai (1990). Head. Antenna 2 peduncular articles slender or slightly incrassate . Mandible left lacinia mobilis 5-cuspidate. Labium without inner lobes, or with possible vestigial inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 small, distinct, or reduced, button-shaped, or fused with article 3. Pereon. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 2 groups of robust setae or with 3 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse or obtuse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute, evenly rounded, without palmar sinuses; without proximal spine or thumb defining palm; dactylus short, recurved distally. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus similar in length to that of pereopod 3; dactylus amplidactylate or homobasidactylate, similar to pereopod 3 dactylus, not thickened proximally or notched or short with mini-wavy posterior margin. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus expanded, carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded, posterior margin with distinct minute serrations, each with a small seta or smooth with sparse seta, posterodistal lobe present, shallow, broadly rounded; merus expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded, subrectangular; carpus shorter than propodus; propodus broad, or propodus slender; length 5.7���7.9 �� width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods 1���3 all well-developed . Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row or with marginal robust setae in 2 rows (M. japonica). Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows (M. japonica). Uropod 3 ramus subequal in length to peduncle, or shorter than peduncle. Telson completely cleft or apically incised, with 3���6 robust setae per lobe. Remarks. Morinoia appears to be most similar to Miyamotoia and Yamatorchestia, both terrestrial genera from Japan and Taiwan. Aside from the well-developed pleopods in Morinoia (all reduced in Miyamotoia and Yamatorchestia), Morinoia has an expanded pereopod 6 merus (not expanded in Miyamotoia and Yamatorchestia), the pereopod 7 merus is expanded and subtriangular in shape (unexpanded in Miyamotoia and Yamatorchestia) and the distolateral robust seta of uropod 1 is absent in Morinoia (present or absent in Miyamotoia and present in Yamatorchestia). Distribution. Korea, China, Japan, Taiwan (Martens 1868, Tattersall 1922, Morino 1999, Miyamoto & Morino 2004 and Cheng et al. 2011)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 31-33, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Bousfield, E. L. (1982) The amphipod superfamily Talitroidea in the northeastern Pacific region. Family Talitridae. Systematics and distributional ecology. National. Museum of Natural Science, Publications in Biological Oceanography, 11, i - vii + 1 - 73.","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Cheng, Y. T., Nakazono, K., Lin, Y. K. & Chan, B. K. K. (2011) Cryptic diversity of the semi-terrestrial amphipod Platorchestia japonica (Tattersall, 1922) (Amphipoda: Talitrida: Talitridae) in Japan and Taiwan, with description of a new species. Zootaxa, 2787 (1), 1 - 18. https: // doi. org / 10.11646 / zootaxa. 2787.1.1","Martens, E. V. (1868) Uber einige ostasiatishe Susswasserthire. Archiv fur Naturgeschichte, Berlin, 34, 1 - 64. [in German] https: // doi. org / 10.5962 / bhl. part. 20475","Tattersall, W. M. (1922) Zoological results of a tour in the Far East. Amphipoda with notes on an additional species of Isopoda. Memoirs of the Asiatic Society of Bengal, 6, 435 - 459, figs 18 - 21.","Morino, H. & Dai, A. Y. (1990) Three amphipod species (Crustacea) from East China. Publications of Itako Hydrobiological Station, 4, 7 - 27.","Morino, H. (2020) The Description of Two New Genera and Four New Species of the Terrestrial Talitridae (Crustacea, Amphipoda) from the Ogasawara and Daito Islands, Southern Japan. Bulletin of the National Museum of Natural Science, Series A, 46 (1), 1 - 23.","Morino H. (1999) Amphipoda. In: Aoki, J. (Ed.), Pictorial Keys to Soil Animals of Japan. Tokai University Press, Tokyo, 626 - 644. [in Japanese]"]}

Tethorchestia palaeorchestes Bousfield & Poinar, 1995 Tethorchestia palaeorchestes Bousfield & Poinar, 1995: 748, figs 1,2. (terrestrial, Oligocene) [Dominican Republic].��� Wildish & LeCroy, 2014: 569, key., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 43, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Bousfield, E. L. & Poinar, G. O. (1995) New terrestrial amphipod from tertiary amber deposits of the Dominican Republic. Journal of Crustacean Biology, 15 (4), 746 - 755. https: // doi. org / 10.2307 / 1548823","Wildish, D. J. & LeCroy, S. E. (2014) Mexorchestia: a new genus of talitrid amphipod (Crustacea, Amphipoda, Talitridae) from the Gulf of Mexico and Caribbean Sea, with the description of a new species and two new subspecies. Zootaxa, 3865 (4), 555 - 577. https: // doi. org / 10.11646 / zootaxa. 3856.4.5"]}

Pickorchestia Lowry & Myers, 2019 Pickorchestia Lowry & Myers, 2019: 71. Type species. Orchestia pickeringi Dana, 1853, monotypy. Included species. Pickorchestia includes 1 species: P. pickeringi (Dana, 1853). Category. Mascupod. Ecological type. Field-hopper, moss-hopper. Habitat. Pickorchestia pickeringi is a terrestrial land-hopper living on Mount Ka���ala, O���ahu at 853 m altitude, in the axils of Astelia, but also collected widely in the Ko���olau Mountains at high altitudes, usually in the axils of Freycinetia arborea. Diagnostic description ( male ). Based on Richardson (1991). Head. Antenna 2 peduncular articles slender . Mandible left lacinia mobilis 5-cuspidate (fifth tiny). Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic, subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse. Gnathopod 2 subchelate; propodus palm slightly acute, irregular, with small mid-palmar sinus, a shallow sinus near dactylar hinge and a shallow distal sinus; without proximal spine or thumb defining palm; dactylus not modified distally, blunt. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 dactylus homobasidactylate, similar to pereopod 3 dactylus, not thickened proximally or notched. Pereopod 5 short, less than 2/3 length of pereopod 6; merus broad, long than broad, expanded distally. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus and carpus not expanded. Pereopod 7 not incrassate ; basis broadly expanded; merus unexpanded; carpus unexpanded; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all slightly reduced. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 3���6 robust setae per lobe or with 7���9 robust setae per lobe. Remarks. Based on gnathopod 2 with a small midpalmar sinus (apomorphic), pereopod 4 dactylus homobasidactylate (apomorphic) and uropod 1 exopod without marginal robust setae (apomorphic) Pickorchestia appears to be a sister taxon to Platorchestia. Distribution. Hawaii. Oahu, (Richardson, 1991)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 37, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Dana, J. D. (1853) Crustacea, Part II. United States Exploring Expedition during the years 1838, 1839, 1840, 1841, 1842, under the command of Charles Wilkes, U. S. N., 14, 686 - 1618.","Richardson, A. M. M. (1991) Two new species of landhoppers (Crustacea: Talitridae) from O'ahu, Hawaiian Islands, with redescription of Platorchestia pickering i and key to landhoppers of O'ahu. Bishop Museum Occasional Papers, 31, 185 - 201."]}

Miyamotoia spinolabrum Morino, 2020 (Fig. 17) Platorchestia sp. Morino, 1991: 232 (part). Miyamotoia spinolabrum Morino, 2020: 4, figs 4, 5. Types. Holotype (NSMT-Cr 26779) female 12.0 mm; Shizukazawa, Hatakejima Island, Ogasawara, Tokyo. Paratype (NSMT-Cr 26780) male 8.8 mm; data as holotype. Type locality. Shizukazawa, Hatakejima Island, Ogasawara, Tokyo, Japan. Ecological type. Forest-hopper. Habitat. Humid forest (Ardisia sieboldii). Size. Male, 8.8 mm, female, 12 mm. Diagnosis ( male ). Based on Morino (2020). Labrum with row of robust setae along anterior margin. Gnathopod 2 dactylus attenuated distally. Pereopod 4 thickened proximally with miniwave along posterior margin. Uropod 1 peduncle distolateral robust seta absent. Uropod 3 ramus longer than peduncle. Remarks. See remarks under M. daitoensis. Distribution. Japan. Ogasawara: Mukojima, Island; Anijima Island; Chichijima Island; Hahajima Island (Morino 2020)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 31, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Morino, H. (2020) The Description of Two New Genera and Four New Species of the Terrestrial Talitridae (Crustacea, Amphipoda) from the Ogasawara and Daito Islands, Southern Japan. Bulletin of the National Museum of Natural Science, Series A, 46 (1), 1 - 23.","Morino, H. (1991) Talitridae from the Ogasawara Islands. In: Report of the Second General Survey on Natural Environment of the Ogasawara (Bonin) Islands. Tokyo Metropolitan University, Tokyo, pp. 231 - 235. [in Japanese]"]}

Key to genera of Platorchestiinae (Adult Males) 1. Gnathopod 1 dactylus cuspidactylate...................................................................... 2 - Gnathopod 1 dactylus simplidactylate..................................................................... 3 2. Uropod 1 peduncle with distolateral robust seta absent.............................................. Platorchestia - Uropod 1 peduncle with distolateral robust seta present............................................. Tethorchestia 3. Antenna 2 distinctly incrassate........................................................................... 4 - Antenna 2 slender or only slightly incrassate................................................................ 7 4. Uropod 1 endopod with marginal setae in one row........................................................... 5 - Uropod 1 endopod with marginal setae in two rows.......................................................... 6 5. Gnathopod 1, 2 propodus palm transverse................................................. Cocorchestia gen. nov. - Gnathopod 1, 2 propodus palm acute......................................................... Mauritiorchestia 6. Gnathopod 2 propodus palm rounded distally or sigmoidal................................. Demaorchestia gen.nov. - Gnathopod 2 propodus palm evenly rounded............................................. Insularorchestia gen. nov. 7. Pereopod 4 dactylus thickened proximally, with notch midway along posterior margin................................8 - Pereopod 4 dactylus not thickened proximally nor with notch on posterior margin.................................. 10 8. Pereopod 7 propodus without distal tuft of setae............................................................. 9 - Pereopod 7 propodus with distal tuft of setae..................................................... Mexorchestia 9 Uropod 1 endopod with marginal robust setae in two rows............................................ Miyamotoia - Uropod 1 endopod with marginal robust setae in one row............................................... Chroestia 10. Gnathopod 2 dactylus blunt distally...................................................................... 11 - Gnathopod 2 dactylus attenuated or acute distally........................................................... 12 11. Gnathopod 2 propodus palm transverse......................................................... Cariborchestia - Gnathopod 2 propodus palm acute.............................................................. Pickorchestia 12 Uropod 1 peduncle, distolateral robust seta present.......................................................... 13 - Uropod 1 peduncle, distolateral robust seta absent.......................................................... 14 13. Pereopod 6 incrassate......................................................................... Vallorchestia - Pereopod 6 not incrassate.................................................................... Yamatorchestia 14 Telson rounded distally, maxillipedal palp slender................................................ Laniporchestia - Telson tapering distally, maxillipedal palp broad....................................................... Morinoia

Mexorchestia carpenteri Wildish & LeCroy, 2014 (Fig. 15) Tethorchestia species B: Bousfield, 1984, pp. 204���205, table. 6. ��� Camp et al., 1998: 131. ��� Tethorchestia ���.��� LeCroy, 2011, pp. 757���758, fig. 590. Mexorchestia carpenteri carpenteri Wildish & LeCroy, 2014: 562, figs 3���6, 569, key. Mexorchestia carpenteri raduloviciae Wildish & LeCroy, 2014: 568, figs 7���8, 569, key. Non-Taxonomic Citations Mexorchestia carpenteri carpenteri.��� Wildish et al., 2016: 1916, table 1 (zoogeography). Types. Holotype, male, 11.5 mm, USNM 1218141. Paratypes: female, 8 mm length, USNM 1218142; 9 males, 5 females, 1 juvenile, USNM 1218143; 1 male, 6 females, CMNC-2012-0020; 2 males; 2 females, USNM 1218144; 13 males, 18 females, 4 juveniles, GCRL 06521. Type locality. Tiger Tail Beach, Marco Island, Florida, USA. (25��56.7'N 81��44.6 '). Ecological type. Beach-hopper. Habitat. Saltmarsh behind the main beach facing the Gulf of Mexico, with a brackish pool subject to tidal changes. Beach-hoppers sheltered under the damp digging wastes and not burrowing. Possibly feeding on the microalgae within the digging pellets (after Wildish & LeCroy 2014). Size. Male, 11.5 mm, female, 8 mm. Diagnosis. Based on Wildish & LeCroy (2014). Antenna 2, flagellum with 13���21 articles in adult males; ovigerous female antenna 2 with 11���13 articles, oostegite 2 with 17���35 marginal setae; telson, each lobe with 1 to 2 distal dorsolateral robust seta; dorsal pigment pattern in both sexes diamond-shaped or diffuse on cephalon (may be absent), linear, quadrate club-shaped or diamond-shaped on mid-line of pleon (present or absent). Remarks. Wildish & LeCroy (2014) set up two subspecies: Mexorchestia carpenteri carpenteri based on antenna 2, flagellum with 13���18 articles in adult males; ovigerous female antenna 2 with 11���13 articles, oostegite 2 with 17���35 marginal setae; telson, each lobe with 1 distal dorsolateral robust seta; dorsal pigment pattern in both sexes diamond-shaped on cephalon (may be absent), linear, quadrate or diamond-shaped on mid-line of pleon (always present) and Mexorchestia carpenteri raduloviciae based on Antenna 2, flagellum with 18���21 articles in adult males longer than 9 mm; ovigerous female antenna 2 with 15���19 articles, oostegite 2 with 15���19 marginal setae; telson, each lobe with 2 distal dorsolateral robust setae; dorsal pigment pattern in both sexes diffuse on cephalon (may be absent); linear, club-shaped or absent on mid-line of pleon. Distribution. USA, Mexico, Belize. North-western Atlantic: Titusville to Ft. Lauderdale, Florida. Gulf of Mexico: Lower Florida Keys to South Padre Island, Texas. Caribbean Sea: Quintana Roo, Yucatan Peninsula, Mexico to Turneffe Island, Belize (Wildish & LeCroy 2014)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 27-29, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Wildish, D. J. & LeCroy, S. E. (2014) Mexorchestia: a new genus of talitrid amphipod (Crustacea, Amphipoda, Talitridae) from the Gulf of Mexico and Caribbean Sea, with the description of a new species and two new subspecies. Zootaxa, 3865 (4), 555 - 577. https: // doi. org / 10.11646 / zootaxa. 3856.4.5","Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amphipoda: Talitridae) of the Indo-Pacific Region. Bishop Museum Special Publication, 72, 171 - 210.","Camp, D., Lyons, W. G. & Perkins, T. H. (1998) Checklists of Selected Shallow-Water Marine Invertebrates of Florida. Florida Department of environmental Protection FMRI Technical Report TR- 3, 1998, 1 - 239.","LeCroy, S. E. (2011) An illustrated identification guide to the nearshore marine and estuarine gammaridean Amphipoda of Florida. Vol. 5. Families Leucothoidae, Liljeborgiidae, Neomegamphopidae, Ochlesidae, Phliantidae, Phoxocephalidae, Platyischnopidae, Pleustidae, Podoceridae, Pontoporeiidae, Sebidae, Stenothoidae, Synopiidae and Talitridae. Florida Department of Environmental Protection, Tallahassee, Florida, 202 pp.","Wildish, D. J., Smith, S. R., Loeza-Quintana, T., Radulovici, A. E. & Adamowicz, S. J. (2016) Diversity and dispersal history of the talitrids (Crustacea: Amphipoda: Talitridae) of Bermuda. Journal of Natural History, 50, 1911 - 1933. https: // doi. org / 10.1080 / 00222933.2016.1180719"]}

Cocorchestia gen. nov. Type species. Talorchestia fritzi Stebbing, 1903. Included species. Cocorchestia includes 2 species. C. fritzi (Stebbing, 1903) comb. nov. and C. margaritae (Stephensen, 1948) comb. nov. Category. Mascupod. Ecological type. Beach hopper. Habitat. Sandy shores. Diagnostic description. Based on Stebbing (1903) and Stephensen (1948). Head. Antenna 2 peduncular articles incrassate . Mouthparts unknown. Maxillipedal palp article 2 probably with distomedial lobe; article 4 probably button-shaped or fused to article 3. Pereon. Gnathopod 1 subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3, 6 or 7 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm transverse, sigmoidal, with broad sinus near dactylar hinge, without proximal sinus; with or without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus not modified distally, blunt. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin. Pereopod 6 not incrassate; basis moderately expanded. Pereopod 7 not incrassate; basis expanded; posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present or posterodistal lobe absent, rounded, produced downwards almost to merus; merus expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded; subrectangular; carpus slightly shorter than propodus; propodus slender; length 8 �� width. Pleon. Pleopods 1���3 unknown. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 1 row. Uropod 3 ramus shorter than peduncle. Telson completely cleft or entire, with 3���6 robust setae per lobe or with 7���9 robust setae per lobe. Remarks. Cocorchestia appears to be most similar to some species of Platorchestia. It differs from Platorchestia in having a simplidactylate first gnathopod and no proximal sinus on the palm of gnathopod 2. It differs from Insularorchestia mainly in the shape and angle of the palm of gnathopod 2 and the broad sinus near the dactylar hinge. Distribution. Costa Rica. Isla del Coco, (Stebbing 1903). Coast of Costa Rica (Shoemaker 1932). Turtle Bay, Isla Santa Cruz, (Monod 1970). Venezuela. Porlamar, Isla Margarita, (Stephensen 1948)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 7, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stebbing, T. R. R. (1903) Amphipoda from Costa Rica. Proceedings of the United States National Museum, 26, 925 - 931, pls. 60 - 61. https: // doi. org / 10.5479 / si. 00963801.26 - 1341.925","Stephensen, K. (1948) Amphipods from Curacao, Bonaire, Aruba and Margarita. Studies on the Fauna Curacao, Aruba, Bonaire, Venezuelan Islands, 11, 1 - 20.","Shoemaker, C. R. (1932) Notes on Talorchestia fritzi Stebbing. Journal of the Washington Academy of Sciences, 22 (7), 184 - 187."]}

Cariborchestia xerophila Smith, 1998 (Fig. 1) Cariborchestia xerophila Smith, 1998: 180, figs 1���43. Non-Taxonomic Citations Cariborchestia xerophila.��� Smith & Wier, 1999: 639, table 1 (ecology). Types. Holotype, female, 6 mm, MCZ. Paratypes: male, 6.5 mm, MCZ; 2 females (ovigerous), 3 males, MCZ. Type locality. A shallow dry sea level playa at the base of the cliffs at Punta Arenas, Playa de Sardinera (0.13 km inland of beach), Isla Mona, Puerto Rican Archipelago, Caribbean Sea (18��04���56������N 67��56���17������E). Ecological type. Field-hopper. Habitat. Living 1.3 km inland of beach, just above sea level. Size. Male, 5���6.5 mm, female, 5���6 mm (ovigerous). Diagnosis ( male ). With the characters of the genus. Remarks. This species occupies a similar habitat to that of species of Orchestia in the Mediterranean Sea, which move off the beach into terrestrial habitats. Distribution. Caribbean Sea. Isla Mona, Puerto Rican archipelago (Smith 1998)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 5, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Smith, D. G. (1998) A new genus and species of terrestrial amphipod from Isla Mona in the Caribbean Sea. Spixiana, 21 (2), 170 - 186.","Smith, D. G. & Wier, A. M. (1999) On some inland Crustacea and their habitats of Mona Island in the northern caribbean region. Crustaceana, 72 (7), 635 - 646. https: // doi. org / 10.1163 / 156854099503681"]}

Insularorchestia gen. nov. Type species. Orchestia ashmoleorum Stock, 1996, current designation. Included species. Insularorchestia includes 3 species: I. ashmoleorum (Stock, 1996) com. nov.; I. monodi (Mateus, Mateus & Afonso, 1986) com. nov. and I. susorum sp. nov. of Stock & Biernbaum, 1994 com. nov.. Ecological type. Beach-hoppers, field-hoppers. Habitat. Sand beaches and under stones at 762 m altitude (Stock & Biernbaum 1994). Etymology. From islands. Diagnostic description ( male ). Based on Mateus, Mateus & Afonso (1986), Stock (1996), Serejo (2004), Morino & Ortal (1995) and Stock & Biernbaum (1994). Head. Antenna 2 peduncular articles incrassate . Mandible left lacinia mobilis 5- or 6-cuspidate. Labium without inner lobes, with possible vestigial inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped or fused with article 3. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 or 4 groups of robust setae, subrectangular or ‘subtriangular’ with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute, evenly rounded or irregular with small to large shallow midpalmar sinus or without distal palmar sinus; with or without proximal spine or thumb defining palm; dactylus not modified distally, blunt or short, recurved distally or attenuated distally. Pereopods 3–7 dactyli bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3 or subequal or slightly shorter than pereopod 3; carpus similar in length to that of pereopod 3 or significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin or short, thickened. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus and carpus not expanded or male merus expanded, carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present or posterodistal lobe absent, shallow, broadly rounded; merus expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded or expanded, subrectangular, subequal to or shorter than propodus; propodus broad or propodus slender; length 4.7–7.3 × width; propodus without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods 1–3 all well-developed. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 2 rows. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus subequal in length to peduncle, or shorter than peduncle. Telson apically incised, with 3–6 robust setae per lobe. Remarks. Insularorchestia is most similar to Platorchestia. It differs in having a simplidactylate gnathopod 1 (cuspidactylate in Platorchestia). Distribution. South Atlantic Ocean. Saint Helena (Stock 1996); Ascension Island (Stock & Biernbaum 1994). North Atlantic Ocean. Azores (Mateus, Mateus & Afonso 1986).

Cariborchestia Smith, 1998 Cariborchestia Smith, 1998: 179. Type species. Cariborchestia xerophila Smith, 1998, monotypy. Included species. Cariborchestia contains 1 species: C. xerophila Smith, 1998. Category. Mascupod. Ecological type. Field-hopper. Habitat. Living 1.3 km inland of beach, just above sea-level. Inhabiting dry, inland shallow sandy playas. Diagnostic description (male). Based on Smith (1998). Head. Antenna 2 peduncular articles slender . Mandible left lacinia mobilis 5-cuspidate (fifth a tiny cusp). Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate (). Gnathopod 2 subchelate; propodus palm transverse, evenly rounded; without palmar sinuses; without proximal spine or thumb defining palm; dactylus not modified distally, blunt. Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3 (); carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin. Pereopod 6 not incrassate; basis moderately expanded; male merus expanded, carpus not expanded. Pereopod 7 slightly incrassate; basis expanded; posterior margin smooth with sparse seta, posterodistal lobe present, shallow, broadly rounded; merus expanded distally, subtriangular, anterior margin slightly convex; carpus slightly expanded, posterior margin straight, anterior margin slightly rounded; carpus shorter than propodus; propodus broad; length 6.6 �� width; propodus with large distal tuft of setae (). Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all reduced. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 7���9 robust setae per lobe. Remarks. Cariborchestia lives in the same geographic areas as Mexorchestia and Tethorchestia and displays similarities with both genera. Cariborchestia retains an unmodified gnathopod 2 dactylus not found in Mexorchestia or Tethorchestia. Cariborchestia differs from both of those genera in having an unmodified, distally blunt dactylus on gnathopod 2. Distribution. Caribbean Sea. Punta Arenas, 0.13 km inland of beach, Playa de Sardinia, Isla Mona (18��04���56���N 67��56���17���W) (Smith 1998)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 3-4, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Smith, D. G. (1998) A new genus and species of terrestrial amphipod from Isla Mona in the Caribbean Sea. Spixiana, 21 (2), 170 - 186."]}

Insularorchestia ashmoleorum (Stock, 1996) comb. nov. (Fig. 10) Platorchestia ashmoleorum Stock, 1996: 151, figs 1, 2–4 (in part).— Miyamoto & Morino, 2004: 69, 88.— Serejo, 2004: 20, table 2.— Lowry, 2012: 14, (key). Non-Taxonomic Citations Platorchestia ashmoleorum.— Wildish & Radulovici, 2019: 2418, table 2, (zoogeography). Types. Holotype, male, 9.2 mm, ZMA. Paratypes: female, 8.5 mm, ZMA; 4 males, 5 females ZMA; 10 males, 10 females ZMA; 1 male, 4 females ZMA; 1 males, 1 female ZMA; 1 male, 4 females ZMA. Type locality. Broad Gut, near junction with Gates of Chaos, St Helena Island, South Atlantic Ocean (50°59’59.84’’S 5°44’00.07’’W). Ecological type. Land-hopper, often near freshwater streams. Habitat. Semi-terrestrial. Freshwater streams. According to Stock, (1996) Insularorchestia ashmoleorum ‘has been encountered only along small guts (=streams) in the dry and hot lowland zone (altitudes 1–40 m) and close to the sea (at 300–750 m in direct line). The gut water in these areas is often slightly salty, not so much through marine influence, as by salts dissolved after rains from the volcanic rocks and sediments. The two talitrid species were never found together’. Size. Male, 9.2–10 mm, female, 8.5 mm. Diagnosis (male). Based on Stock (1996). Gnathopod 1 simplidactylate. Gnathopod 2 propodus palm evenly rounded, without proximal sinus; dactylus short, recurved distally with slight posterior projection near dactylar hinge. Pereopod 7 not incrassate; propodus broad; length 6.6 × width. Uropod 1 endopod with marginal robust setae in 2 rows . Remarks. Insularorchestia ashmoleorum exhibits a homoplasy with Platorchestia ano in which the distal end of the gnathopod 2 dactylus is distinctively shortened and recurved. The simplidactylate dactylus on male gnathopod 1 distinguishes it from these species. Like Morinoia, I. ashmoleorum has no sexual dimorphism in P7, but Morinoia does not have an incrassate A2. Distribution. South Atlantic Ocean. St. Helena (Stock 1996).

Laniporchestia lanipo (Richardson, 1991) (Fig. 13) Platorchestia lanipo Richardson, 1991: 186, figs 1���3.��� Springthorpe & Lowry, 1994: 22.��� Bousfield & Poinar, 1995: 754.��� Stock, 1996: 156.��� Miyamoto & Morino, 2004: 69.��� Serejo & Lowry, 2008: 189.��� Cheng et al., 2011: 16. Laniporchestia lanipo Lowry & Myers, 2019: 53, fig. 23. Non-Taxonomic Citations Platorchestia lanipo.��� Wildish & Radulovici, 2019: 2422, table 4 (zoogeography).��� Sfenthourakis et al. 2020: 376 (evolution/biogeography). Types. Holotype, female, BPBM 14563. Paratypes: male, 6 females, 6 males, 4 juveniles; 4 females, 3 males, 3 juveniles, NMNS NMCC 1990���0583; 5 females, 7 males, 15 juveniles, AM P.40429; 3 females, 1 male, 1 juveniles, BMNH 1990:44:5. Type locality. Highest point of Lanipo Trail (2,520 ft.), Mau���umae Ridge, Ko���olau Range, Hawaii (~ 21��18���49 ������N 157��46���20������W). Ecological type. Moss-hopper. Habitat. Terrestrial in moss on windward side of ridge. Size. 8.5 mm. Diagnosis ( male ). With the characters of the genus. Remarks. According to Miyamoto & Morino (2004) Laniporchestia lanipo belongs to Platorchestia group 3. Unfortunately a female was illustrated and described. Only gnathopods 1 and 2 were illustrated for the male. Although the author���s claims that all other male characters are like the female, this may not account for subtle differences in pereopod 7 for instance. We have been able to diagnose the genus on non-incrassate characters except for the male gnathopod 1. Distribution. Hawaii, Oahu (Richardson 1991)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 23-25, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Richardson, A. M. M. (1991) Two new species of landhoppers (Crustacea: Talitridae) from O'ahu, Hawaiian Islands, with redescription of Platorchestia pickering i and key to landhoppers of O'ahu. Bishop Museum Occasional Papers, 31, 185 - 201.","Springthorpe, R. T. & Lowry, J. K. (1994) Catalogue of crustacean type specimens in the Australian Museum, Malacostraca. Technical Reports of the Australian Museum, 11, 1 - 134. https: // doi. org / 10.3853 / j. 1031 - 8062.11.1994.68","Bousfield, E. L. & Poinar, G. O. (1995) New terrestrial amphipod from tertiary amber deposits of the Dominican Republic. Journal of Crustacean Biology, 15 (4), 746 - 755. https: // doi. org / 10.2307 / 1548823","Stock, J. H. (1996) The genus Platorchestia (Crustacea, Amphipoda) on the Mid-Atlantic islands, with description of a new species from Saint Helena. Miscellania Zoologica, 19 (1), 149 - 157.","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Serejo, C. S. & Lowry, J. K. (2008) The coastal Talitridae (Amphipoda, Talitroidea) of Southern and Western Australia with Comments on Platorchestia platensis (Kroyer, 1845). Records of the Australian Museum, 60 (2 / 3), 161 - 206. https: // doi. org / 10.3853 / j. 0067 - 1975.60.2008.1491","Cheng, Y. T., Nakazono, K., Lin, Y. K. & Chan, B. K. K. (2011) Cryptic diversity of the semi-terrestrial amphipod Platorchestia japonica (Tattersall, 1922) (Amphipoda: Talitrida: Talitridae) in Japan and Taiwan, with description of a new species. Zootaxa, 2787 (1), 1 - 18. https: // doi. org / 10.11646 / zootaxa. 2787.1.1","Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Wildish, D. J. & Radulovici, A. E. (2019) Zoogeography and evolutionary ecology of the genus Platorchestia (Crustacea, Amphipoda, Talitridae). Journal of Natural History, 53 (39 - 40), 2413 - 2435. https: // doi. org / 10.1080 / 00222933.2019.1704463","Sfenthourakis, S., Myers, A. A., Taiti, S. & Lowry, J. K. (2020) Terrestrial Environments. Chapter 14. In: Poore, G. C. B. & Thiel, M. (Eds.), The Natural History of Crustacea. Evolution and Biogeography, 8, pp. 375 - 388. https: // doi. org / 10.1093 / oso / 9780190637842.003.0014"]}

Key to genera of Platorchestiinae (Adult Males) 1. Gnathopod 1 dactylus cuspidactylate...................................................................... 2 - Gnathopod 1 dactylus simplidactylate..................................................................... 3 2. Uropod 1 peduncle with distolateral robust seta absent.............................................. Platorchestia - Uropod 1 peduncle with distolateral robust seta present............................................. Tethorchestia 3. Antenna 2 distinctly incrassate........................................................................... 4 - Antenna 2 slender or only slightly incrassate................................................................ 7 4. Uropod 1 endopod with marginal setae in one row........................................................... 5 - Uropod 1 endopod with marginal setae in two rows.......................................................... 6 5. Gnathopod 1, 2 propodus palm transverse................................................. Cocorchestia gen. nov. - Gnathopod 1, 2 propodus palm acute......................................................... Mauritiorchestia 6. Gnathopod 2 propodus palm rounded distally or sigmoidal................................. Demaorchestia gen.nov. - Gnathopod 2 propodus palm evenly rounded............................................. Insularorchestia gen. nov. 7. Pereopod 4 dactylus thickened proximally, with notch midway along posterior margin................................8 - Pereopod 4 dactylus not thickened proximally nor with notch on posterior margin.................................. 10 8. Pereopod 7 propodus without distal tuft of setae............................................................. 9 - Pereopod 7 propodus with distal tuft of setae..................................................... Mexorchestia 9 Uropod 1 endopod with marginal robust setae in two rows............................................ Miyamotoia - Uropod 1 endopod with marginal robust setae in one row............................................... Chroestia 10. Gnathopod 2 dactylus blunt distally...................................................................... 11 - Gnathopod 2 dactylus attenuated or acute distally........................................................... 12 11. Gnathopod 2 propodus palm transverse......................................................... Cariborchestia - Gnathopod 2 propodus palm acute.............................................................. Pickorchestia 12 Uropod 1 peduncle, distolateral robust seta present.......................................................... 13 - Uropod 1 peduncle, distolateral robust seta absent.......................................................... 14 13. Pereopod 6 incrassate......................................................................... Vallorchestia - Pereopod 6 not incrassate.................................................................... Yamatorchestia 14 Telson rounded distally, maxillipedal palp slender................................................ Laniporchestia - Telson tapering distally, maxillipedal palp broad....................................................... Morinoia, Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 47, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681

Demaorchestia parapacifica (Kim, Jung & Min, 2013) comb. nov. (Fig. 8) Platorchestia parapacifica Kim, Jung & Min, 2013: 829, figs 2–7. Type material. Holotype, male, 19.2 mm, NIBRIVOOOO268878. Paratypes: 6 male, 5 females, NIBRIV- OOOO268879–87, same data holotype. Type locality. Geumseongcheon Stream, Jeju-do, South Korea (33°26’N 126°17’E). Ecological type. Beach-hoppers. Habitat. “Living mainly on the sandy shores around river mouths (salinity ranged between 5–20 psu). It is usually found under rotting hay or in silt beside the water.” (Kim, Jung & Min (2013). Molecular data. 596 bp CO1 gene sequences (GenBank accession numbers KF016044 - KF016047) were obtained from four specimens of the new species. Size. 19.2 mm, female, 13.5 mm. Diagnosis ( male ). Based on Kim, Jung & Min (2013). Gnathopod 2 propodus with midpalmar sinus; dactylus blunt or apically pinched. Epimeron 3 posterior margin smooth. Telson with 10–11 robust setae per lobe . Remarks. Demaorchestia parapacifica is the only species in the genus with at least 10 robust setae on each telson lobe. Distribution. South Korea. Sehwa Beach (33°31’N 126°51’E), Jeju-do, South Korea; Seomjin River (34°59’N 127°46’E), Jeollanam-do, South Korea; Osipcheon Stream (36°21’N 129°22’E), Gyeongsangbuk-do (Kim, Jung & Min, 2013).

Cocorchestia fritzi (Stebbing, 1903) comb. nov. (Fig. 3) Talorchestia fritzi Stebbing, 1903: 925, pl. 60.��� Shoemaker, 1932: 184, fig. 1.��� Stephensen, 1948: 11.��� Ortiz, 1977: 9.��� Galan, 1984: 136 (PhD thesis).��� Wakabara & Serejo, 1998: 583 (checklist).��� Martin & Diaz, 2003: 339.��� Serejo, 2004: 25, 26.��� Ruffo & Krapp-Schickel, 2005: 37.��� Garc��a-Madrigal, 2007: 127, Appendix, 188.��� Foster et al., 2009: 216, Species List 21.1.��� Ortiz & Lalana, 2010: 87.��� Barro et al., 2013: 40 (checklist).��� Herrera, 2012: 9 (checklist).��� Martin et al., 2013: 1682, 1716, Appendix 1.��� Ortiz & Lalana, 2019: 67. Not Talorchestia fritzi. ��� Schellenberg, 1938: 211 (= ��� Talorchestia ��� tucurauna (M��ller, 1864)).���Monod, 1970: 31, figs 55���69 (= Cocorchestia sp., Santa Cruz Island, Galapagos).��� Peck, 1994: 61, key. Non-Taxonomic Citations Talorchestia fritzi.��� Oca��a et al., 2012: 32, 33, table 2 (ecology). Types. Syntypes, 5 specimens, USNM 28785, Cocos Island, Costa Rica (5��31���45������N 87��3���36������W). Additional material. 10 specimens, USNM 106205, about 200 specimens, USNM 106206 Type locality. Cocos Island, Costa Rica. Ecological type. Beach-hopper. Habitat. There is no information on habitat in the original description of Stebbing (1903) or in the subsequent description of Shoemaker (1932), the first reviewer. According to Oca��a et al. (2012) C. fritzi is living on sandy beaches. Size. 5���9 mm. Diagnosis (male). Based on Stebbing (1903) and Shoemaker (1932). Gnathopod 2 propodus palm transverse, rounded proximally, with large distal sinus, without proximal spine defining palm; dactylus not modified distally, blunt. Pereopod 7 not incrassate. Uropods 1 and 2 endopod each with marginal setae in one row. Telson with 4 robust setae per lobe. Remarks. Shoemaker (1932) had new material of this species from Costa Rica which indicated a very different morphology of the male gnathopod 2. However Shoemaker clearly indicated that his specimens were larger (and more mature) than those of Stebbing. Unfortunately Shoemaker only illustrated the anterior parts of his specimen. Both species (C. fritzi and C. margaritae) have an unmodified dactylus on male gnathopod 2 and uropods 1 and 2 with only one row of marginal setae on the endopods. Cocorchestia fritzi and C. margaritae each have a large distal sinus on the palm of male gnathopod 1. They differ in the distinctive proximal spine guarding the palm of male gnathopod 2 in P. margaritae. Species reported by Monod (1970) and Peck (1994) are not P. fritzi. However specimens from both records are available. The specimen which Monod (1970) illustrated has a differently shaped propodus on gnathopod 2, shorter and broader, almost round, with a shorter palm and dactylus and is similar to Platorchestia. Uropod 2 is also shorter than that of Stebbing (1903) and the ramus of uropod 3 is longer than the peduncle (shorter in illustration of Stebbing (1903)). They don���t appear to be the same species. Stebbing���s male was apparently about 9 mm. Monod doesn���t appear to give a size for his male. Distribution. Costa Rica. Isla da Coca (Stebbing 1903); Galapagos. Turtle Bay, Santa Cruz Island (Monod 1970), Isla Genovesa, Bahia Darwin (Peck 1994)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 9, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stebbing, T. R. R. (1903) Amphipoda from Costa Rica. Proceedings of the United States National Museum, 26, 925 - 931, pls. 60 - 61. https: // doi. org / 10.5479 / si. 00963801.26 - 1341.925","Shoemaker, C. R. (1932) Notes on Talorchestia fritzi Stebbing. Journal of the Washington Academy of Sciences, 22 (7), 184 - 187.","Stephensen, K. (1948) Amphipods from Curacao, Bonaire, Aruba and Margarita. Studies on the Fauna Curacao, Aruba, Bonaire, Venezuelan Islands, 11, 1 - 20.","Ortiz, M. (1977) Invertebrados Marinos Bentonicos de Cuba. - I. Crustacea Amphipoda, Gammaridae. Ciencias, Series 8, 38, 3 - 10.","Galan, A. (1984) A systematic study of Amphipoda (Crustacea) of the Caribbean coast of Venezuela. Thesis doctoral, Department of Pure and Applied Biology, Imperial College of Science and Technology, London University, London, 422 pp.","Wakabara, Y. & Serejo, C. S. (1998) Malacostraca Peracarida. Amphipoda. Gammaridea and Caprellidea. In: Young, P. S. (Ed.), Catalogue of Crustacean of Brazil. Serie Livros 6, Museu Nacional, pp. 561 - 594.","Martin, A. & Diaz, Y. J. (2003) La fauna de anfipodos (Crustacea: Amphipoda) de las aguas costeras de la region oriental de Venezuela. Boletin. Instituto Espanol de Oceanografia, 19 (1 - 4), 327 - 344. [in Spanish]","Serejo, C. S. (2004) Talitridae (Amphipoda, Gammaridea) from the Brazilian coastline. Zootaxa, 646 (1), 1 - 29. https: // doi. org / 10.11646 / zootaxa. 646.1.1","Ruffo, S. & Krapp-Schickel, T. (2005) Catalogue of the amphipod collection in the Museo Civico di Storia Naturale Verona (Crustacea, Malacostraca). Museo Civico di Storia Naturale di Verona Serie Cataloghi, 3, 1 - 98.","Garcia-Madrigal, M. S. (2007) Annotated checklist of the amphipods (Peracarida: Amphipoda) from the tropical eastern Pacific. Contributiones Estudio Crustaceos Pacifico Este, 4 (2), 63 - 195.","Foster, J. M., LeCroy, S. E., Heard, R. W. & Rita Vargas, R. (2009) Gammaridean amphipods. In: DuMont, H. J. (Ed.), Marine Biodiversity of Costa Rica, Central America. Monographiae Biologicae, 89, pp. 265 - 274. https: // doi. org / 10.1007 / 978 - 1 - 4020 - 8278 - 8 _ 24","Ortiz, M. & Lalana, R. (2010) Distribucion de los anfipodos (Crustacea, Malacostraca, Peracarida) de los subordenes Gammaridea, Caprellidea e Hyperiidea, presentes en el Archipielago Cubano / Distribution of the amphipod crustaceans (Crustacea, Malacostraca, Peracarida) on the suborder. Revista da Investigaciones Matinas, 31 (2), 75 - 90.","Barro, A., Fonseca, E., Ortiz, M. & Lalana, R. (2013) Lista de los crustaceos marinos y estuarinos (Arthropoda, Crustacea) de Boca de Canasi, Mayabeque, Cuba List of marine and estuarine crustacean (Arthropoda, Crustacea) of Boca de Canasi, Mayabeque, Cuba. Revista Cubana de Ciencias, 2 (1), 38 - 42.","Herrera, H. W. (2012) CDF checklist of Galapagos terrestrial crustaceans. FCD Lista de especies de Crustaceos Terrestres de Galapagos. In: Bungartz, F., Herrera, H., Jaramillo, P., Tirado, N., Jimenez-Uzcategui, G., Ruiz, D., Guezou, A. & Ziemmeck, F. (Eds.), Charles Darwin Foundation Galapagos Species Checklist, 2012, pp. 1 - 9","Martin, A., Diaz, Y. J., Miloslavich, Escobar-Briones, P. E., Guerra-Garcia, J. M., Ortiz, M., Valencia, B., Giraldo, A. & Klein, E. (2013) Diversidad regional de Amphipoda en el Mar Caribe. Revista de Biologia, 61 (4), 1681 - 1720. https: // doi. org / 10.15517 / rbt. v 61 i 4.12816","Ortiz, M. & Lalana, R. (2019) Lista Taxonomica actualizada de los anfipodos (Crustacea, Peracarida) de Cuba. Revista de Investigaciones Marinas, 39 (2), 63 - 77. [http: // www. cim. uh. cu / rim /]","Schellenberg, A. (1938) Brasilianische Amphipoden, niit biologischen Bemerkungen. Zoologische Jahrbucher Abteilung fur Systematik, 71, 203 - 218, 5 figs.","Muller, F. (1864) Fur Darwin. Wilhelm Engelmann, Leipzig, 91 pp., 65 figs. https: // doi. org / 10.5962 / bhl. title. 168646","Peck, S. B. (1994) Diversity and zoogeography of the non-oceanic Crustacea of the Galapagos Islands, Ecuador (excluding terrestrial Isopoda). Canadian Journal of Zoology, 72 (1), 54 - 69. https: // doi. org / 10.1139 / z 94 - 009","Ocana, F. A., Apin, Y., Cala, Y., Vega, A., Fernandez, A. & Cordova, E. (2012) Distribucion espacial de los macroinvertebrados de playas arenosas de Cuba oriental. Revista de Investigaciones Marinas, 32 (1), 30 - 37. [in Spanish]"]}

Tethorchestia antillensis Bousfield, 1984 (Fig. 22) Tethorchestia antillensis Bousfield, 1984: 205.��� Ciavatti, 1989: 139, figs 12���14.��� Lindeman, 1991: 1105, table 1.��� Bousfield & Poinar, 1995: 751, fig. 3.��� Varela, Ortiz & Lalana, 2003: 74.��� Lalana, Ortiz & Varela, 2005: 53.��� LeCroy et al., 2009: 962.��� Ortiz & Lalana, 2010: 87.��� LeCroy, 2011: 759, fig. 589.��� Paz-R��os et al., 2013: 183, table 2, 186, fig. 2K.��� Wildish & Martell, 2013: 314, fig. 3, 315.��� Wildish & LeCroy, 2014: 558, figs 1, 2, 569, key.��� Wildish et al., 2016: 1916, table 1, 1920.��� Paz-R��os et al., 2018: 8, table 1.��� Lowry & Myers, 2019: 84, figs 38, 39.��� Ortiz & Lalana, 2019: 68. Thetorchestia (sic) antillensis.��� Ortiz, Martin & Diaz, 2007: 516. Types. Holotype, 12.0 mm, NMNS. Paratypes, female (ovigerous), 11.0 mm, NMNS; several male, female, and immature specimens, NMNS. Type locality. Ascension Bay, Quintana, Yucatan Peninsula, Mexico. Ecological type. Beach-hopper. Habitat. Marine supralittoral, sand beach inside reef. Diagnosis ( male ). Based on Ciavatti (1989). Gnathopod 2 dactylus attenuated distally. Pereopod 6 male merus and carpus not expanded. Pereopod 7 basis moderately expanded. Telson with 7 robust setae per lobe. Remarks. Tethorchestia antillensis and T. karukerae are very similar. They show subtle differences in the shape of the gnathopod 2 dactylus and the articles of pereopods 6 and 7, but differ mainly in the number of setae on the telson. Distribution. Ascension Bay, Mexico (Bousfield 1984). Caribbean Sea (Ciavatti 1989). Florida, Yucatan (Mexico), Petites Antilles (according to Ciavatti 1989)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 40, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amphipoda: Talitridae) of the Indo-Pacific Region. Bishop Museum Special Publication, 72, 171 - 210.","Ciavatti, G. (1989) Les Talitres (Crustacea. Amphipoda) des plages de la Guadeloupe. Description de deux especes nouvelles. Annales de l'Institut Oceanographique, Paris, 65 (2), 127 - 146. [in French]","Lindeman, D. (1991) Phylogeny and zoogeography of the New World terrestrial amphipods (landhoppers) (Crustacea: Amphipoda; Talitridae). Canadian Journal of Zoology, 69, 1104 - 1116. https: // doi. org / 10.1139 / z 91 - 155","Bousfield, E. L. & Poinar, G. O. (1995) New terrestrial amphipod from tertiary amber deposits of the Dominican Republic. Journal of Crustacean Biology, 15 (4), 746 - 755. https: // doi. org / 10.2307 / 1548823","Varela, C., Ortiz, M. & Lalana, R. (2003) Crustaceos (Peracarida y Decapoda), de la costa sur de la Peninsula de Guanahacabibes, Cuba. Revista de Investigaciones Marinas, 24 (1), 73 - 76.","Lalana, R., Ortiz, M. & Varela, C. (2005) Primera adicion a la lista de los crustaceos no decapodos de Cuba. Revista Biologia, 2005, 50 - 56.","LeCroy, S. E., Gasca, R., Winfield, I., Ortiz, M. & Escobar-Briones, E. (2009) Amphipoda (Crustacea) of the Gulf of Mexico. In: Felder, D. L. & Camp, D. K. (Eds.), Gulf of Mexico - Origins, Waters, and Biota. Biodiversity. Texas A & M University Press, College Station, Texas, pp. 941 - 972.","Ortiz, M. & Lalana, R. (2010) Distribucion de los anfipodos (Crustacea, Malacostraca, Peracarida) de los subordenes Gammaridea, Caprellidea e Hyperiidea, presentes en el Archipielago Cubano / Distribution of the amphipod crustaceans (Crustacea, Malacostraca, Peracarida) on the suborder. Revista da Investigaciones Matinas, 31 (2), 75 - 90.","LeCroy, S. E. (2011) An illustrated identification guide to the nearshore marine and estuarine gammaridean Amphipoda of Florida. Vol. 5. Families Leucothoidae, Liljeborgiidae, Neomegamphopidae, Ochlesidae, Phliantidae, Phoxocephalidae, Platyischnopidae, Pleustidae, Podoceridae, Pontoporeiidae, Sebidae, Stenothoidae, Synopiidae and Talitridae. Florida Department of Environmental Protection, Tallahassee, Florida, 202 pp.","Paz-Rios, C. E., Nuno Simoes, N. & Ardisson, P. (2013) Intertidal and shallow water amphipods (Amphipoda: Gammaridea and Corophiidea) from Isla Perez, Alacranes Reef, southern Gulf of Mexico. Nauplius, 21 (2), 179 - 194. https: // doi. org / 10.1590 / S 0104 - 64972013000200005","Wildish, D. J. & Martell, D. J. (2013) Digital recording of epidermal dorsal pigment patterns in amphipods (Crustacea). Zoosystematics and Evolution, 89 (2), 311 - 316. https: // doi. org / 10.1002 / zoos. 201300016","Wildish, D. J. & LeCroy, S. E. (2014) Mexorchestia: a new genus of talitrid amphipod (Crustacea, Amphipoda, Talitridae) from the Gulf of Mexico and Caribbean Sea, with the description of a new species and two new subspecies. Zootaxa, 3865 (4), 555 - 577. https: // doi. org / 10.11646 / zootaxa. 3856.4.5","Wildish, D. J., Smith, S. R., Loeza-Quintana, T., Radulovici, A. E. & Adamowicz, S. J. (2016) Diversity and dispersal history of the talitrids (Crustacea: Amphipoda: Talitridae) of Bermuda. Journal of Natural History, 50, 1911 - 1933. https: // doi. org / 10.1080 / 00222933.2016.1180719","Paz-Rios, C. E., Nuno Simoes, N. & Pech, D. (2018) A dataset on the species composition of amphipods (Crustacea) in a Mexican marine national park: Alacranes Reef, Yucatan. Biodiversity Data Journal, 6, e 22622. https: // doi. org / 10.3897 / BDJ. 6. e 22622","Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Ortiz, M. & Lalana, R. (2019) Lista Taxonomica actualizada de los anfipodos (Crustacea, Peracarida) de Cuba. Revista de Investigaciones Marinas, 39 (2), 63 - 77. [http: // www. cim. uh. cu / rim /]","Ortiz, M., Martin, A. & Diaz, Y. (2007) Lista y referencias de los crustaceos anfipodos (Amphipoda: Gammaridea) del Atlantico occidental tropical. Revista da biologia. Tropical, 55 (2), 479 - 498. https: // doi. org / 10.15517 / rbt. v 55 i 2.6026"]}

Morinoia humicola (Martens, 1868) (Fig. 18) Orchestia humicola Martens, 1868: 56���57.��� Weber, 1892: 569.��� Stebbing, 1906; 539.��� Della Valle, 1893: 509.��� Spandl, 1924: 461.��� Stephensen, 1935: 6. Platorchestia humicola.��� Morino, 1991: 65, figs 206 (key), 213���1.��� Morino, 1999: 629 (key) 636, fig, 1, 643.��� Miyamoto & Morino, 2004: 69, key, 88, figs 11���15.��� Tomikawa, 2017: 254, table 1. Morinoia humicola.��� Lowry & Myers, 2019: 61. Non-Taxonomic Citations Platorchestia humicola.��� Wildish & Radulovici, 2019: 2422, table 4 (zoogeography). Types. Lectotype, ZMB 2809 a, paralectotypes, ZMB 2809 b. Additional material. Two specimens, ZMB 3457 as additional material 809. Type locality. Yokohama, Japan. Ecological type. Marsh-hoppers. Habitat. Living under fallen leaves and grass in the coastal area in the northern region (Demao, Shuilien, Tachi) and a garden near the coast of Fulung in Taiwan. Size. Male, 7���8 mm, female, 8���10 mm. Diagnosis ( male ). Based on Miyamoto & Morino (2004). Pleopods rami about half the peduncle length. Uropod 3 ramus about half the length of peduncle. Telson completely cleft, with 4 robust setae per lobe. Remarks. According to Miyamoto & Morino (2004) M. humicola and M. paludosus are very similar. They are separated by the pleopodal rami (about as long as the peduncle in M. paludosus and about half the peduncle length in M. humicola) and the uropod 3 ramus (about 0.7 �� the length of the peduncle in M. paludosus and about half the length in P. humicola). Distribution. Japan. Yokohama (Martens, 1868). Taiwan. Demao, Shuilien, Tachi and Fulung (Miyamoto & Morino 2004)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 33-34, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Martens, E. V. (1868) Uber einige ostasiatishe Susswasserthire. Archiv fur Naturgeschichte, Berlin, 34, 1 - 64. [in German] https: // doi. org / 10.5962 / bhl. part. 20475","Weber, M. (1892) Die Susswasser-Crustaceen des Indischen Archipels, nebst bemerkungen Uber die Susswasser-Fauna im Allgemeinen. Zoologische Ergebnisse einer Reise in Niederlandisch Ost-Indien, 2, 528 - 571, 30 pls, 22 figs. [in German]","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, i - xxxix + 1 - 806.","Della Valle, A. (1893) Gammarini del golfo di Napoli. Fauna und Flora des Golfes von Neapel und der angrenzenden Meeres- Abschnitte, 20, xi - 948, 61 pls.","Spandl, H. (1924) Studien uber Susswasseramphipoden I. Akademie der Wissenschaftliche in Wien. Mathematisch-Naturwissenschaftliche Klasse, Sitzungberichte, 133, 431 - 525.","Stephensen, K. (1935) Indo-Pacific terrestrial Talitridae. Bernice P. Bishop. Museum Occasional Papers, 10, 1 - 20.","Morino, H. (1991) Talitridae from the Ogasawara Islands. In: Report of the Second General Survey on Natural Environment of the Ogasawara (Bonin) Islands. Tokyo Metropolitan University, Tokyo, pp. 231 - 235. [in Japanese]","Morino H. (1999) Amphipoda. In: Aoki, J. (Ed.), Pictorial Keys to Soil Animals of Japan. Tokai University Press, Tokyo, 626 - 644. [in Japanese]","Miyamoto, H. & Morino, H. (2004) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan. II. The genus Platorchestia. Publications of the Seto Marine Biological Laboratory, 40, 67 - 96. https: // doi. org / 10.5134 / 176317","Tomikawa, K. (2017) Species Diversity and Phylogeny of Freshwater and Terrestrial Gammaridean Amphipods (Crustacea) in Japan. In: Motokawa, M. & Kajihara, H. (Eds.), Species Diversity of Animals in Japan. Diversity and Commonality in Animals. Springer, Tokyo, pp. 249 - 267. https: // doi. org / 10.1007 / 978 - 4 - 431 - 56432 - 4 _ 9","Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Wildish, D. J. & Radulovici, A. E. (2019) Zoogeography and evolutionary ecology of the genus Platorchestia (Crustacea, Amphipoda, Talitridae). Journal of Natural History, 53 (39 - 40), 2413 - 2435. https: // doi. org / 10.1080 / 00222933.2019.1704463"]}

Cocorchestia margaritae (Stephensen, 1948) comb. nov. (Fig. 4) Talorchestia margaritae Stephensen, 1948: 7, figs 1, 2, Table 2.��� Ruffo, 1950: 50.��� Galan, 1984: 137 (PhD thesis).��� K��nemann, 1997:10.��� Barrios & Lemus, 2000: 139.��� Martin & Diaz, 2003: 339.��� Ruffo & Krapp-Schickel, 2005: 37.��� Martin et al., 2013: 1716. Non-Taxonomic Citations Talorchestia margaritae.��� Blanco, 1980: 44 pp. (biology, thesis).��� Venables, 1981a: 89 (physiology).��� Venables, 1981b: 182 (growth).��� Venables, 1981c: 271 (population dynamics).��� Correa, 1985: 11 (caloric content).��� S��nchez, 1985: 51 pp (biology, thesis).��� Dias & Sprung, 2003: 1137 (population dynamics).��� Huck, Martin & Miloslavich, 2007: 3, 4, fig. 1, 5, table 1, figs 2, 3 (protein content).��� L��pez et al., 2010: 841, 844, table 1, 846, table 2, (ecology).��� Wildish et al., 2011: 1249, table 3. Types. Holotype, male, 12 mm. Paratypes, 2 males, 1 female, ZMUC. Type locality. Patio of Hotel Central, Porlamar, Margarita Island, Venezuela, under stones in the patio about 60 m from the sandy sea shore. Ecological type. Beach-hoppers. Habitat. Living at the back of sandy beaches. Diagnosis (male). Based on Stephensen (1948). Gnathopod 2 propodus palm without proximal sinus, with large distal sinus; with proximal spine defining palm. Pereopod 7 not incrassate. Telson with 7���8 robust setae per lobe. Remarks. Platorchestia margaritae differs from the other species in the genus in having a large spine defining the proximal margin of the palm of male gnathopod 2. Venables (1981 a ���c) describes aspects of the physiology and ecology of the species. Martin & Diaz (2003) reported it as common on sandy beaches in Anzo��tegui, Nueva Esparta and Sucre, Venezuela. Distribution. Venezuela. Margarita Island (Stephensen 1948): Cuman�� (Venables 1981 a ���c)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 9-11, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stephensen, K. (1948) Amphipods from Curacao, Bonaire, Aruba and Margarita. Studies on the Fauna Curacao, Aruba, Bonaire, Venezuelan Islands, 11, 1 - 20.","Ruffo, S. (1950) Studi sui Crostacei Anfipodi. XXII. Anfipodi Del Venezuela Raccolti dal dott. G. Marcuzzi. Memorie del Museo Civico di Storia Naturale di Verona, 2, 49 - 65. https: // doi. org / 10.1080 / 11250005009436799","Galan, A. (1984) A systematic study of Amphipoda (Crustacea) of the Caribbean coast of Venezuela. Thesis doctoral, Department of Pure and Applied Biology, Imperial College of Science and Technology, London University, London, 422 pp.","Konemann, S. (1997) West Indian amphipod families and genera of the Wagenaar Hummelinck expeditions (Amphipoda, Crustacea) List of sampling stations 1930 - 1973. Verslagen en technische gegevens, 72, 1 - 12, 3 maps.","Barrios, J. & Lemus, A. (2000) Estructura y dinamica de comunidades asociadas a cultivos de Gracilariopsis tenuifrons (Gracilariaceae) en Chacopata, Sucre, Venezuela. 1: Inventario faunistico. Revista de Biologia Tropical, 48 (Supplement 1), 1, 137 - 143. [in Spanish]","Martin, A. & Diaz, Y. J. (2003) La fauna de anfipodos (Crustacea: Amphipoda) de las aguas costeras de la region oriental de Venezuela. Boletin. Instituto Espanol de Oceanografia, 19 (1 - 4), 327 - 344. [in Spanish]","Ruffo, S. & Krapp-Schickel, T. (2005) Catalogue of the amphipod collection in the Museo Civico di Storia Naturale Verona (Crustacea, Malacostraca). Museo Civico di Storia Naturale di Verona Serie Cataloghi, 3, 1 - 98.","Martin, A., Diaz, Y. J., Miloslavich, Escobar-Briones, P. E., Guerra-Garcia, J. M., Ortiz, M., Valencia, B., Giraldo, A. & Klein, E. (2013) Diversidad regional de Amphipoda en el Mar Caribe. Revista de Biologia, 61 (4), 1681 - 1720. https: // doi. org / 10.15517 / rbt. v 61 i 4.12816","Blanco, J. P. (1980) Contribucion al conocimiento de la biologia de Talorchestia margaritae Stephensen 1948 (Amphipoda: Talitridae). Thesis, Universidad de Oriente, Cumana, 44 pp.","Venables, B. J. (1981 a) Oxygen Consumption in a Tropical Beach Amphipod, Talorchestia margaritae Stephensen: Effects of Size and Temperature. Crustaceana, 41 (1), 89 - 94. https: // doi. org / 10.1163 / 156854081 X 00101","Venables, B. J. (1981 b) Energy allocation for growth and metabolism in Talorchestia margaritae (Amphipoda, Talitridae). Crustaceana, 41 (2), 182 - 189. https: // doi. org / 10.1163 / 156854081 X 00228","Venables, B. J. (1981 c) Aspects of the population biology of a Venezuelan beach amphipod, Talorchestia margaritae (Talitridae), including estimates of biomass and daily production, and respiration rates. Crustaceana, 41 (3), 271 - 285. https: // doi. org / 10.1163 / 156854081 X 00859","Correa, M. (1985) Estimacion del contenido calorico de Talorchestia margaritae (Talitridae: Amphipoda). Boletino del Instituto Oceanografico Universidad De Oriente, 24 (1 - 2), 11 - 14. [in Italian]","Sanchez, L. (1985) Algunos aspectos biologicos de Talorchestia margaritae Stephensen, 1948 (Amphipoda: Talitridae), de la Isla de Margarita, Venezuela. Tesis de Licenciatura, Universidad de Oriente, Cumana, 51 pp. [in Spanish]","Dias, N. & Sprung, M. (2003) Population dynamics and production of the amphipod Orchestia gammarellus (Talitridae) in a Ria Formosa saltmarsh (southern Portugal). Crustaceana, 76 (9), 1123 - 1141. https: // doi. org / 10.1163 / 156854003322753448","Huck, E., Martin, A. & Miloslavich, P. (2007) Contenido proteico en los diferentes estadios embrionarios de Talorchestia margaritae (Amphipoda: Talitridae) durante su desarrollo intra-marsupial. Revista de Biologia Tropical, 55 (Supplement 1), 1 - 8. [in Spanish with English summary, ISSN- 0034 - 7744] https: // doi. org / 10.15517 / rbt. v 55 i 0.5799","Lopez, S., Diaz, Y., Noris, K. & Cabrera, A. (2010) Lipidos en el anfipodo Talorchestia margaritae (Amphipoda: Talitridae) y su relacion con la ecologia de la especie. Revista de Biologia Tropical, 58 (3), 841 - 855. https: // doi. org / 10.15517 / rbt. v 58 i 2.5250","Wildish, D. J., Kraft, A., Pohle, G. W. & LeCroy, S. E. (2011) Variation in body size of two species of supralittoral talitrids (Amphipoda, Talitroidea) from the Gulf of Mexico and Atlantic coasts of North America. Crustaceana, 84 (10), 1243 - 1250. https: // doi. org / 10.1163 / 156854011 X 587504"]}

Mauritiorchestia Green, Appadoo, Lowry & Myers, 2021 Type species. Mauritiorchestia fayetta Green, Appadoo, Lowry & Myers, 2021, original designation. Included species. Mauritiorchestia includes 1 species: M. fayetta Green, Appadoo, Lowry & Myers, 2021. Ecological type. Sand-hopper. Habitat. Coastal sandy substrate with huge amount of beach wrack algae. Diagnostic description ( male ). Head. Antenna 2 peduncular articles incrassate . Mandible left lacinia mobilis 5-cuspidate. Maxilla 1 palp absent . Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 fused with article 3. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 4 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute, rounded distally and sigmoidal, with small to large midpalmar sinus, without proximal sinus, without large distal sinus, without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus strongly curved, subequal in length to palm, not modified distally, blunt. Pereopods 3���5 cuspidactylate, 6���7 simplidactylate. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus expanded, carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded, posterior margin smooth or minutely serrate margin without setae, posterodistal lobe present, rounded, produced downwards almost to merus; merus expanded distally, subtriangular, anterior margin slightly straight; carpus expanded, subrectangular, subrectangular, slightly shorter than propodus; propodus slender. Pleon. Pleopods 1���3 all well-developed. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 3 ramus subequal in length to peduncle. Telson completely cleft, with 3���6 robust setae per lobe. Remarks. Mauritiorchestia is currently the only platorchestiine known from the Indian Ocean and the only platorchestiine amphipod with pereopods 3���5 cuspidactylate and 6���7 simplidactylate and lacking a palp on maxilla 1. It belongs in the group with an incrassate second antenna. It differs from Platorchestia in having a simplidactylate first gnathopod. It has a very similar gnathopod 2 palm and dactylus to the South Korean genus Demaorchestia. Distribution. Mauritius (Green, Appadoo, Lowry & Myers 2021)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on page 25, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681

Demaorchestia mie sp. nov. (Fig. 7) Orchestia platensis.��� Stephensen, 1945: 57���59, figs 15���16.��� Gurjanova, 1951: 807���808, fig. 562. Types. Holotype male NHMD-873662. Paratypes, 1 female, NHMD-876532, 21 males and females, NHMD- 876533. Type locality. Mie prefecture (central Japan, about 35��N 136��E), on the coast. Ecological type. Beach-hoppers or marsh-hoppers. Habitat. Sandy beaches. Size. Unknown. Etymology. Named for the Mie prefecture in central Japan. Diagnosis. Based on Stephensen (1945). Gnathopod 2 dactylus pinched apically. Pereopod 7 basis posterodistal lobe absent. Epimera posterior margins strongly serrate. Remarks. Demaorchestia mie is a distinctive species separated from other species of Demaorchestia by the pinched dactylus of male gnathopod 2 and the strongly serrate posterior margin of epimeron 3. Distribution. Japan (Stephensen 1945)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 13-14, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Stephensen, K. (1945) Some Japanese Amphipodes. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, 108, 25 - 88.","Gurjanova, E. F. (1951) Bokoplavy morej SSSR i sopredel'nykh vod (Amphipoda-Gammaridea). Akademiia Nauk SSSR, Opredeliteli po Faune SSSR, 41, 1 - 1029, 705 figs. [in Russian]"]}

Pickorchestia pickeringi (Dana, 1853) (Fig. 21) Orchestia Pickeringii Dana, 1853: 882, pl. 59, fig. 9a���f.��� Spence Bate, 1862: 32, 369, pl. V, fig. 6. Orchestia pickeringii.��� Stebbing, 1900: 528, pl. XXIB (Vol. 11).��� Stebbing, 1906: 538.��� Stebbing, 1910: 645. Orchestia pickeringi.��� Stephensen, 1935: 8.���J.L. Barnard, 1955: 20, fig. 11a���p. Floresorchestia pickeringi.��� Bousfield, 1984: 204, table 6.��� Lowry & Springthorpe, 2009b: 117, 121, 122. Floresorchestia pickeringii.��� Friend & Richardson, 1986: 28. Platorchestia pickeringi.��� Richardson, 1991: 195, figs 7���9. Pickorchestia pickingeri.��� Lowry & Myers, 2019:71. Non-Taxonomic Citations Platorchestia pickeringi.��� Wildish & Radulovici, 2019: 2422, table 4 (zoogeography). Types. Lost. Type locality. Oahu, Hawaii. Ecological type. Field-hopper, moss-hopper. Habitat. Pickorchestia pickeringi is a terrestrial land-hopper living on Mount Ka���ala, O���ahu at 853 m altitude, in the axils of Astelia, but also collected widely in the Ko���olau Mountains at high altitudes, usually in the axils of Freycinetia arborea. Size. Male, 13.0 mm, female, 15.0 mm. Diagnosis. With the characters of the genus. Distribution. Hawaii. Oahu: Lanipo Trail, Manoa Cliffs Trail, Mount Tantalus; Poamoho Trail, Pe���ahinai���a Trail, Ko���olau Mountains (Richardson, 1991)., Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 38-39, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681, {"references":["Dana, J. D. (1853) Crustacea, Part II. United States Exploring Expedition during the years 1838, 1839, 1840, 1841, 1842, under the command of Charles Wilkes, U. S. N., 14, 686 - 1618.","Spence Bate, C. S. (1862) Catalogue of the specimens of amphipodous Crustacea in the collection of the British Museum. Trustees, British Museum, London, 399 pp.","Stebbing, T. R. R. (1900) Crustacea Amhipoda. In: Sharp, D. (Ed.), Fauna Hawaiiensis or the Zoology of the Sandwich Isles. 2 (5). Cambridge University Press, Cambridge, pp. 527 - 530, pl. 21.","Stebbing, T. R. R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, i - xxxix + 1 - 806.","Stebbing, T. R. R. (1910) Scientific results of the trawling expedition of H. M. C. S. \" Thetis \". Crustacea. Part V. Amphipoda. Australian Museum Memoir, 4, 565 - 658, pls. 47 - 60. https: // doi. org / 10.3853 / j. 0067 - 1967.4.1910.1508","Stephensen, K. (1935) Indo-Pacific terrestrial Talitridae. Bernice P. Bishop. Museum Occasional Papers, 10, 1 - 20.","Barnard, J. L. (1955) Gammaridean Amphipoda Crustacea in the collections of Bishop Museum. Bernice P. Bishop Museum Bulletin, 215, 1 - 46.","Bousfield, E. L. (1984) Recent advances in the systematics and biogeography of landhoppers (Amphipoda: Talitridae) of the Indo-Pacific Region. Bishop Museum Special Publication, 72, 171 - 210.","Lowry, J. K. & Springthorpe, R. T. (2009 b) The genus Floresorchestia (Amphipoda, Talitridae), on Cocos (Keeling) and Christmas Islands. Memoirs Museum Victoria, 66, 117 - 127. https: // doi. org / 10.24199 / j. mmv. 2009.66.13","Friend, J. A. & Richardson, A. M. M. (1986) Biology of terrestrial Amphipods. Annual Review of Entomology, 31, 25 - 48. https: // doi. org / 10.1146 / annurev. en. 31.010186.000325","Richardson, A. M. M. (1991) Two new species of landhoppers (Crustacea: Talitridae) from O'ahu, Hawaiian Islands, with redescription of Platorchestia pickering i and key to landhoppers of O'ahu. Bishop Museum Occasional Papers, 31, 185 - 201.","Lowry, J. K. & Myers, A. A. (2019) New genera of Talitridae in the revised Superfamily Talitroidea Bulycheva 1957 (Crustacea, Amphipoda, Senticaudata). Zootaxa, 4553 (1), 1 - 100. https: // doi. org / 10.11646 / zootaxa. 4553.1.1","Wildish, D. J. & Radulovici, A. E. (2019) Zoogeography and evolutionary ecology of the genus Platorchestia (Crustacea, Amphipoda, Talitridae). Journal of Natural History, 53 (39 - 40), 2413 - 2435. https: // doi. org / 10.1080 / 00222933.2019.1704463"]}

Subfamily Platorchestiinae subfam. nov. Type genus. Platorchestia Bousfield, 1982, original designation. Included genera. Platorchestiinae includes 15 genera: Cariborchestia Smith, 1998; Chroestia Marsden & Fenwick, 1984; Cocorchestia gen. nov.; Demaorchestia gen. nov.; Insularorchestia gen. nov.; Laniporchestia Lowry & Myers, 2019; Mauritiorchestia Green, Appadoo, Lowry & Myers, 2021; Mexorchestia Wildish & LeCroy, 2014; Miyamotoia Morino, 2020; Morinoia Lowry & Myers, 2019; Pickorchestia Lowry & Myers, 2019; Platorchestia Bousfield, 1982; Tethorchestia Bousfield, 1984; Vallorchestia Lowry, 2012 and Yamatorchestia Takahashi & Morino, 2020. Ecological types. Beach-hoppers, marsh-hoppers, sand-hoppers, driftwood-hoppers, moss-hoppers, field-hoppers, forest-hoppers, riparian-hoppers and cave-hoppers. Diagnostic description ( male ). Based on Miyamoto & Morino (2004) and Lowry & Myers (Delta Database to World Talitroidea) Head. Antenna 2 peduncular articles slender or incrassate; article 3 without plate ventrally. Mandible left lacinia mobilis 4-, 5, or 6- cuspidate. Maxilliped palp article 2 with distomedial lobe. Labium with or without inner lobes or with possible vestigial inner lobes. Pereon. Gnathopod 1 subchelate ; posterior margin of carpus and propodus each with lobe covered in palmate setae; dactylus simplidactylate or cuspidactylate. Gnathopod 2 subchelate ; propodus palm acute or transverse, evenly rounded, rounded distally, sigmoidal or irregular, without large recurved robust setae lining palm, with or without sinuses along palmar margin, with or without a proximal spine or thumb defining palm; dactylus not modified distally and blunt or short or recurved distally, attenuated distally or slender, distally acute. Pereopods 3–7 bicuspidactylate. Pereopod 4 significantly shorter than pereopod 3 or subequal or slightly shorter than pereopod 3; carpus similar in length to pereopod 3 or significantly shorter than carpus of pereopod 3; dactylus amplidactylate or homobasidactylate, dactylus similar to pereopod 3 dactylus, not thickened proximally or notched or thickened proximally with notch midway along posterior margin or short with mini-wavy posterior margin. Pereopod 6 incrassate or not, basis expanded or moderately expanded. Pereopod 7 incrassate or not. Oostegites (female) setae with simple smooth tips or with spatulate tips. Pleon. Pleopods 1–3 all well-developed or all reduced. Epimera 1–3 without slits along ventral margins . Uropods 1–2 rami without apical spear-shaped setae. Uropod 1 peduncle distolateral robust seta present or distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 or 2 rows. Uropod 2 exopod with marginal robust setae in 1 or 2 rows; endopod with marginal robust setae in 1 or 2 rows. Uropod 3 peduncle with or without 1 or 2 long robust setae dorsal margin. Telson with 3 to 10 robust setae per lobe. Remarks. The Platorchestiinae differ from the Floresorchestiinae in having no slits along the ventral margins of the epimera. They differ from the Pseudorchestoideinae in having no distal spear-shaped setae on the uropodal rami. The Platorchestiinae differ from the Talitrinae in having the combination of gnathopod 1 subchelate; with palmate lobes on the carpus and propodus but absent on the merus; uropod 1 without marginal robust setae on the exopodite. Talitrinae that exhibit some combination of these character states are Talorchestia, Sinorchestia and Vietorchestia but they have a parachelate gnathopod 1 and Pyatokovestia, that has a palmate lobe on the merus. Aokiorchestia Morino, 2020 differs from the Platorchestiinae in having a row of marginal setae on the exopod of uropod 1. Talorchestia Dana, 1852, also differs from the Platorchestiinae in having the male gnathopod 2 palm strongly acute with large, recurved robust setae along the palm. Vietorchestia is poorly described but apparently has no distomedial lobe on article 2 of the maxilliped palp. This character state would seemingly exclude the genus from the Talitridae, but its similarity to Talorchestia would suggest that if the structure is truly missing it is probably convergent with Talorchestia the loss being a homoplasy rather than a synapomorphy. Distribution. Atlantic Ocean. USA Atlantic coast (Bousfield 1973), Gulf of Mexico (Wildish & LeCroy, 2014) and Caribbean Sea (Smith 1998, Wildish & LeCroy 2014). Brazil, Venezuela (Stebbing, 1903, Stephensen 1948). Atlantic Ocean Saint Helena Island (Stock 1996), Ascension Island (Stock & Biernbaum 1994) and the Azores (Mateus, Mateus & Afonso 1986). Baltic Sea, European coast, Mediterranean Sea (Chevreux & Fage 1925, Bellan- Santini & Krapp-Schickel 1993); Israel (Morino & Ortal, 1995). Pacific Ocean. Canada. China (Hou & Li 2005), Hawaii (Richardson 1991), Galapagos (Monod 1970), Costa Rica (Stebbing, 1903, Shoemaker 1932, Monod 1970). Tonga (Lowry & Bopiah, 2013). Australia: Queensland (Marsden & Fenwick 1984), New South Wales, South Western Australia (Serejo & Lowry 2008). Fiji (Myers 1985). Eastern Russia (Derzhavin 1937), Korea (Kim & Kim 1987), Japan (Jo 1988, Morino 2020, Takahashi et al. 2021), Taiwan (Miyamoto & Morino 2004, Cheng et al. 2011, Kim, Jung & Min 2013). Indian Ocean. Mauritius (Green et al. 2021). Iraq (Salman & Abdullah 1997). India (Chilton 1921); South Africa (Griffiths 1975).

Mexorchestia Wildish & LeCroy, 2014 Mexorchestia Wildish & LeCroy, 2014: 561. “ Tethorchestia ”.— LeCroy, 2011: 757. Type species. Mexorchestia carpentaria carpentaria Wildish & LeCroy, 2014, original designation. Included species. Mexorchestia includes 1 species: M. carpenteri Wildish & LeCroy, 2014. Category. Mascupod. Ecological type. Beach-hopper. Habitat. Found on bare white sand and from wrack consisting of macroalgae and mangrove litter (Wildish & LeCroy 2014). Diagnostic description ( male ). Based on Wildish & LeCroy (2014). Head. Antenna 2 peduncular articles slightly incrassate . Mandible left lacinia mobilis 5-cuspidate (tiny fifth cusp), or 4-cuspidate. Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 2 groups of robust setae, ‘subtriangular’ with welldeveloped posterodistal lobe, palm transverse; dactylus? simplidactylate. Gnathopod 2 subchelate; propodus palm acute, evenly rounded, without palmar sinuses; without large distal sinus; without proximal spine or thumb defining palm; dactylus attenuated distally. Pereopods 3–7 dactyli bicuspidactylate. Pereopod 4 dactylus amplidactylate, thickened proximally with notch midway along posterior margin. Pereopod 6 shorter than pereopod 7; not incrassate; basis expanded; male merus and carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin smooth or minutely serrate margin with numerous small robust setae, posterodistal lobe absent; merus slightly expanded distally, subtriangular, anterior margin slightly convex; carpus unexpanded, subrectangular; propodus broad; length 6.7 × width, male with large distal tuft of setae. Oostegites (female) setae with spatulate tips . Pleon. Pleopods all slightly reduced. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 7 to at least 10 robust setae per lobe. Remarks. Wildish & LeCroy (2014) discuss the very close relationship between Mexorchestia and Tethorchestia. They distinguish the genera on the relative development of the distolateral robust seta on the peduncle of uropod 1, the shape of the female gnathopod 2 basis and the shape of the oostegites. The slightly incrassate second antenna and large distal tuft of setae on the propodus of pereopod 7 and the distally attenuated dactylus of gnathopod 2 distinguish Mexorchestia and Tethorchestia from all other platorchestiine genera. There are several other characters separating these genera. Mexorchestia has a slightly incrassate antenna 2 (incrassate in Tethorchestia); pereopod 6 merus expanded in Mexorchestia (not expanded in Tethorchestia), pereopod 7 basis without a posterodistal lobe in Mexorchestia (present in Tethorchestia) and oostegites with spatulate tips in Mexorchestia (simple in Tethorchestia). Distribution. USA: Florida. Caribbean Sea, Yucatan Peninsula to Belize (Wildish & LeCroy 2014).

Mauritiorchestia fayetta sp. nov. (Figs 1, 2) Platorchestia fayetta Beeltah & Appadoo, 2017: 44 (nomen nudum). Material Examined. HOLOTYPE, 1 male, 9.8 mm from Poste la Fayette (20°8.2’S, 57°44.5’E), Mauritius, on coastal sandy substrate with huge amount of beach wrack algae, A. Green, (20 November 2014), NHM/ 2021/01/01. PARATYPES: 1 female, 8.6 mm, NHM/ 2021/02/01, other paratypes; 3 males NHM/ 2021/03/01, 5 females NNHM / 2021/04/01, same data as holotype; 6 females, 4 males, same data as holotype, author’s (CA) collection, Mauritius. Etymology. Named after the type locality Poste la Fayette. Description. Male holotype, length. 9.8 mm. Body laterally compressed. Head height equal to length. Eyes medium sized round. Antenna 1 shorter than peduncle of antenna 2; peduncular article 2 longer than peduncular article 1; not geniculate; flagellum with 5 articles and a small terminal article. Antenna 2 incrassate, longer than antenna 1; not geniculate; peduncular articles broad and long with sparse, small and robust setae; peduncular article 2 longer than peduncular article 1; flagellum longer than peduncle, 13 articles and a small terminal article. Mandible palp absent; left lacinia mobilis 5 cuspidate; incisor 5 dentate; setal row with 4 plumose setae. Maxilla 1 palp absent; inner plate with setae on margin and two strong apical plumose setae; outer plate with 7 strong medially serrate robust setae. Maxilla 2 inner plate with round distal margin with one strong, long plumose seta on lateral margin; outer plate with round distal margin with especially long setae on apex and fine setae on lateral margin. Maxilliped palp with 3 well developed articles, article 4 vestigial, visible only from ventral view. Lower lip with narrow lobes and wide shoulders; apical setal tuft present. Gnathopod 1 sexually dimorphic; subchelate; palmate lobe present on posterior margin of carpus and propodus; propodus subtriangular; palm transverse; dactylus as long as palm, triangular, thick. Gnathopod 2 sexually dimorphic; subchelate; larger and more robust than gnathopod 1; coxa as long as wide; basis broad; carpus triangular; propodus massive, with anterior margin convex, palm sinuous, notch in the middle of palm, row of marginal setae on palm; dactylus as long as palm, inner face with minute robust setae on margin; dactylus fitting into sulcus internally. Coxae 2–4 as long as broad. Pereopod 3 longer than pereopod 4; cuspidactylate. Pereopod 4 cuspidactylate with a thick dactylus compared to pereopod 3. Pereopod 5 shorter than pereopod 6; coxa bilobate with small robust setae on each lobe; propodus longer than carpus; cuspidactylate. Pereopod 6 not sexually dimorphic, coxa weakly serrate; merus, carpus and propodus all broadened, propodus longer than carpus, homosimplidctylate. Pereopod 7 posterior distal margin of basis serrate; merus and carpus subrectangular; homosimplidactylate. Uropod 1 biramous; 16 robust setae in two rows on peduncle; exopod 0.7 x as long as peduncle; endopod with 5 setae on inner margin; exopod without marginal robust setae. Uropod 2 biramous; inner margin of peduncle with 3 robust setae; exopod 0.8 x as long as peduncle; rami subequal in length, inner margin of endopod with 3 robust setae; exopod without marginal robust setae Uropod 3 uniramous; ramus 0.9 x as long as peduncle; peduncle with 4 robust setae; ramus narrowing distally, with 4 setae on inner margin and 4 apical setae. Telson entire; broader than long; apically incised; 6 robust setae per lobe; dorsal midline entire. Female (sexually dimorphic characters). 8.6 mm. Gnathopod 1 parachelate; propodus subrectangular; lobe absent at posterior margin of carpus and propodus; dactylus longer than palm. Gnathopod 2 mitten-shaped, smaller than gnathopod 2 in males; coxa with protuberance; basis enlarged and elliptical; dactylus shorter than of males and shorter than palm; palm with 3 small robust setae. Pereopod 6 coxa subquadrate with protuberance; basis posterior margin convoluted; basis narrower than in male; merus, carpus and propodus unexpanded. Pereopod 7 merus and carpus unexpanded. Distribution. Poste la Fayette, Mauritius.

Mauritiorchestia gen. nov. Type species. Mauritiorchestia fayetta sp. nov. Included species. Mauritiorchestia is currently monotypic. Category. Mascupod. Ecological type. Sand-hopper. Etymology. A compound noun derived from the name of the country and the name of a related genus. Diagnostic description ( male ). Head. Antenna 1 short, not reaching midpoint of peduncular article 5 of antenna 2. Antenna 2 peduncular articles incrassate . Mandible left lacinia mobilis 5-cuspidate. Maxilla 1 palp absent . Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 fused with article 3. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 4 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 sexually dimorphic; subchelate; propodus palm acute, rounded distally and sinuous, with small to large midpalmar sinus, without proximal sinus, without large distal sinus, without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus not modified distally, blunt, fitting into sulcus internally. Pereopods 3���5 cuspidactylate, 6���7 simplidactylate. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin. Pereopod 6 subequal in length to pereopod 7; not sexually dimorphic; basis moderately expanded; male merus expanded, carpus not expanded. Pereopod 7 not sexually dimorphic; basis broadly expanded, posterior margin smooth or minutely serrate margin without setae, posterodistal lobe present, rounded, produced downwards almost to merus; merus expanded distally, subtriangular, anterior margin slightly straight; carpus expanded, subrectangular, slightly shorter than propodus; propodus slender. Pleon. Pleopods 1���3 all well-developed. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 3 ramus subequal in length to peduncle. Telson completely cleft, with 6 robust setae per lobe. Remarks. Mauritiorchestia is a distinctive Indian Ocean genus. Based on an incrassate second antenna, gnathopod 1 with palmate lobes on the carpus and propodus and uropod 1 exopod without marginal robust setae, it is most similar to the north-western Pacific genus Sinorchestia Miyamoto & Morino, 1999 and the wide-ranging genus Platorchestia Bousfield, 1982. Sinorchestia differs significantly from Mauritiorchestia in having a ventral plate on the third peduncular article of antenna 2, a parachelate first gnathopod and a large posteroproximal sinus on the dactylus of gnathopod 2. Platorchestia differs from Mauritiorchestia mainly in having a cuspidactylate first gnathopod and the exopod of uropod 2 with marginal robust setae in one row. Distribution. Mauritius, Western Indian Ocean., Published as part of Green, M. A. A., Appadoo, C., Lowry, J. K. & Myers, A. A., 2021, A new genus and species of sand-hopper, Mauritiorchestia fayetta gen. nov., sp. nov (Amphipoda, Talitridae) from Mauritius, pp. 295-300 in Zootaxa 5068 (2) on pages 296-297, DOI: 10.11646/zootaxa.5068.2.9, http://zenodo.org/record/5704439, {"references":["Miyamoto, H. & Morino, H. (1999) Taxonomic studies on the Talitridae (Crustacea, Amphipoda) from Taiwan I. The genera Talorchestia and Sinorchestia n. gen. Publications of the Seto Marine Biological Laboratory, 38, 169 - 200.","Bousfield, E. L. (1982) The amphipod superfamily Talitroidea in the northeastern Pacific region. Family Talitridae. Systematics and distributional ecology. National. Museum of Natural Science, Publications in Biological Oceanography, 11, i - vii + 1 - 73."]}

Mauritiorchestia fayetta sp. nov. (Figs 1, 2) Platorchestia fayetta Beeltah & Appadoo, 2017: 44 (nomen nudum). Material Examined. HOLOTYPE, 1 male, 9.8 mm from Poste la Fayette (20��8.2���S, 57��44.5���E), Mauritius, on coastal sandy substrate with huge amount of beach wrack algae, A. Green, (20 November 2014), NHM/ 2021/01/01. PARATYPES: 1 female, 8.6 mm, NHM/ 2021/02/01, other paratypes; 3 males NHM/ 2021/03/01, 5 females NNHM / 2021/04/01, same data as holotype; 6 females, 4 males, same data as holotype, author���s (CA) collection, Mauritius. Etymology. Named after the type locality Poste la Fayette. Description. Male holotype, length. 9.8 mm. Body laterally compressed. Head height equal to length. Eyes medium sized round. Antenna 1 shorter than peduncle of antenna 2; peduncular article 2 longer than peduncular article 1; not geniculate; flagellum with 5 articles and a small terminal article. Antenna 2 incrassate, longer than antenna 1; not geniculate; peduncular articles broad and long with sparse, small and robust setae; peduncular article 2 longer than peduncular article 1; flagellum longer than peduncle, 13 articles and a small terminal article. Mandible palp absent; left lacinia mobilis 5 cuspidate; incisor 5 dentate; setal row with 4 plumose setae. Maxilla 1 palp absent; inner plate with setae on margin and two strong apical plumose setae; outer plate with 7 strong medially serrate robust setae. Maxilla 2 inner plate with round distal margin with one strong, long plumose seta on lateral margin; outer plate with round distal margin with especially long setae on apex and fine setae on lateral margin. Maxilliped palp with 3 well developed articles, article 4 vestigial, visible only from ventral view. Lower lip with narrow lobes and wide shoulders; apical setal tuft present. Gnathopod 1 sexually dimorphic; subchelate; palmate lobe present on posterior margin of carpus and propodus; propodus subtriangular; palm transverse; dactylus as long as palm, triangular, thick. Gnathopod 2 sexually dimorphic; subchelate; larger and more robust than gnathopod 1; coxa as long as wide; basis broad; carpus triangular; propodus massive, with anterior margin convex, palm sinuous, notch in the middle of palm, row of marginal setae on palm; dactylus as long as palm, inner face with minute robust setae on margin; dactylus fitting into sulcus internally. Coxae 2���4 as long as broad. Pereopod 3 longer than pereopod 4; cuspidactylate. Pereopod 4 cuspidactylate with a thick dactylus compared to pereopod 3. Pereopod 5 shorter than pereopod 6; coxa bilobate with small robust setae on each lobe; propodus longer than carpus; cuspidactylate. Pereopod 6 not sexually dimorphic, coxa weakly serrate; merus, carpus and propodus all broadened, propodus longer than carpus, homosimplidctylate. Pereopod 7 posterior distal margin of basis serrate; merus and carpus subrectangular; homosimplidactylate. Uropod 1 biramous; 16 robust setae in two rows on peduncle; exopod 0.7 x as long as peduncle; endopod with 5 setae on inner margin; exopod without marginal robust setae. Uropod 2 biramous; inner margin of peduncle with 3 robust setae; exopod 0.8 x as long as peduncle; rami subequal in length, inner margin of endopod with 3 robust setae; exopod without marginal robust setae Uropod 3 uniramous; ramus 0.9 x as long as peduncle; peduncle with 4 robust setae; ramus narrowing distally, with 4 setae on inner margin and 4 apical setae. Telson entire; broader than long; apically incised; 6 robust setae per lobe; dorsal midline entire. Female (sexually dimorphic characters). 8.6 mm. Gnathopod 1 parachelate; propodus subrectangular; lobe absent at posterior margin of carpus and propodus; dactylus longer than palm. Gnathopod 2 mitten-shaped, smaller than gnathopod 2 in males; coxa with protuberance; basis enlarged and elliptical; dactylus shorter than of males and shorter than palm; palm with 3 small robust setae. Pereopod 6 coxa subquadrate with protuberance; basis posterior margin convoluted; basis narrower than in male; merus, carpus and propodus unexpanded. Pereopod 7 merus and carpus unexpanded. Distribution. Poste la Fayette, Mauritius., Published as part of Green, M. A. A., Appadoo, C., Lowry, J. K. & Myers, A. A., 2021, A new genus and species of sand-hopper, Mauritiorchestia fayetta gen. nov., sp. nov (Amphipoda, Talitridae) from Mauritius, pp. 295-300 in Zootaxa 5068 (2) on pages 297-298, DOI: 10.11646/zootaxa.5068.2.9, http://zenodo.org/record/5704439, {"references":["Beeltah, S. & Appadoo, C. (2017) Aspects of the biology of Platorchestia fayetta sp. nov. (Crustacea, Amphipoda) at Poste La Fayette, Mauritius. Western Indian Ocean Journal of Marine Science, Special Issue 1, 43 - 49."]}

Mauritiorchestia gen. nov. Type species. Mauritiorchestia fayetta sp. nov. Included species. Mauritiorchestia is currently monotypic. Category. Mascupod. Ecological type. Sand-hopper. Etymology. A compound noun derived from the name of the country and the name of a related genus. Diagnostic description ( male ). Head. Antenna 1 short, not reaching midpoint of peduncular article 5 of antenna 2. Antenna 2 peduncular articles incrassate . Mandible left lacinia mobilis 5-cuspidate. Maxilla 1 palp absent . Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 fused with article 3. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa much smaller that coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 4 groups of robust setae, ‘subtriangular’ with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 sexually dimorphic; subchelate; propodus palm acute, rounded distally and sinuous, with small to large midpalmar sinus, without proximal sinus, without large distal sinus, without proximal spine or thumb defining palm; without large projection near dactylar hinge; dactylus not modified distally, blunt, fitting into sulcus internally. Pereopods 3–5 cuspidactylate, 6–7 simplidactylate. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin. Pereopod 6 subequal in length to pereopod 7; not sexually dimorphic; basis moderately expanded; male merus expanded, carpus not expanded. Pereopod 7 not sexually dimorphic; basis broadly expanded, posterior margin smooth or minutely serrate margin without setae, posterodistal lobe present, rounded, produced downwards almost to merus; merus expanded distally, subtriangular, anterior margin slightly straight; carpus expanded, subrectangular, slightly shorter than propodus; propodus slender. Pleon. Pleopods 1–3 all well-developed. Uropod 1 peduncle distolateral robust seta absent; exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 2 exopod without marginal robust setae; endopod with marginal robust setae in 1 row. Uropod 3 ramus subequal in length to peduncle. Telson completely cleft, with 6 robust setae per lobe. Remarks. Mauritiorchestia is a distinctive Indian Ocean genus. Based on an incrassate second antenna, gnathopod 1 with palmate lobes on the carpus and propodus and uropod 1 exopod without marginal robust setae, it is most similar to the north-western Pacific genus Sinorchestia Miyamoto & Morino, 1999 and the wide-ranging genus Platorchestia Bousfield, 1982. Sinorchestia differs significantly from Mauritiorchestia in having a ventral plate on the third peduncular article of antenna 2, a parachelate first gnathopod and a large posteroproximal sinus on the dactylus of gnathopod 2. Platorchestia differs from Mauritiorchestia mainly in having a cuspidactylate first gnathopod and the exopod of uropod 2 with marginal robust setae in one row. Distribution. Mauritius, Western Indian Ocean.