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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"]}

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."]}

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"]}

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]"]}