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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."]}