Two new species of Protohyale (Amphipoda: Senticaudata: Hyalidae) from remote oceanic islands of Trindade and Saint Peter and Saint Paul, Brazil
DOI:
https://doi.org/10.11606/1807-0205/2026.66.030Keywords:
Crustacea, Amphipoda, Benthic fauna, Taxonomy, Marine biodiversity, Southwestern AtlanticAbstract
Two new species of the hyalid amphipod genus Protohyale Bousfield & Hendrycks, 2002 are described from remote oceanic islands off Brazil. Protohyale trinitensis sp. nov., from Trindade Island, was previously misidentified as P. macrodactyla (Stebbing, 1899). The new species is distinguished from congeners by the adult male gnathopod 1 with the palmar corner defined by a blunt spine accompanied by two robust setae, and by the male gnathopod 2 with a nearly straight palm lacking processes and lined with long plumose setae. Protohyale sanctipauli sp. nov., from the Saint Peter and Saint Paul Archipelago, can be recognized by the adult male gnathopod 1 with the palmar corner defined by a single robust seta and by the male gnathopod 2 with a concave palm occupying almost the entire posterior margin and defined by two robust setae. With the description of these species, the genus Protohyale now includes 49 recognized species worldwide. The occurrence of P. trinitensis sp. nov. also demonstrates that previous Brazilian records attributed to P. macrodactyla likely represent misidentifications, indicating the need for a taxonomic reassessment of that species in the region.
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References
Barnard, J.L. 1979. Littoral gammaridean Amphipoda from the Gulf of California and the Galapagos Islands. Smithsonian Contributions to Zoology, 271: 1-149. https://doi.org/10.5479/si.00810282.271.
Barnard, K.H. 1916. Contributions to the Crustacean Fauna of South Africa № 5. The Amphipoda. Annals of the South African Museum, 15(3): 105-302. https://doi.org/10.5962/bhl.part.22196.
Bousfield, E.L. & Hendrycks, E.A. 2002. The talitroidean amphipod family Hyalidae revised, with emphasis on the North Pacific fauna: systematics and distributional ecology. Amphipacifica, 3(3): 17-134. https://www.biodiversitylibrary.org/page/52466004.
Bulyčeva, A.I. 1957. Morskie blokhi morej SSSR i sopredelnykh vod (Amphipoda – Talitroidea). Akademija Nauk SSSR, Opredeliteli po Faune SSSR, 65: 1-185.
Clemente, C.C.C.; Araújo-Silva, C.L.; Santos, R.G.O.; Paresque, K.; Lucatelli, D.; Neres, P.F.; Souza-Filho, J.F.; Santos, C.S.G.; Esteves, A.M. & Santos, P.J.P. 2024. Small-scale vertical distribution of macrofauna on a shallow tropical coral reef. Estuarine, Coastal and Shelf Science, 297: 108631. https://doi.org/10.1016/j.ecss.2024.108631.
Fernandes, A.C.S.; Almeida, T.C.M. & Serejo, C.S. 2026. Substrate-associated amphipod and isopod fauna in the Cagarras Islands natural monument and surrounding waters, Rio de Janeiro, Brazil. Regional Studies in Marine Science, 94: 1-10, 104797. https://doi.org/10.1016/j.rsma.2026.104797.
Guedes-Silva, E.; Souza-Filho, J.F. & Tavares, M. 2024. Three new species of Amphipoda (Crustacea: Peracarida) from the remote oceanic island of Trindade, off the coast of south-eastern Brazil. Journal of Natural History, 58(45-48): 2075-2098. https://doi.org/10.1080/00222933.2024.2410452.
Haswell, W.A. 1879. On some additional new genera and species of amphipodous crustaceans. Proceedings of the Linnean Society of New South Wales, 4: 319-350, pls. 18-24. https://doi.org/10.5962/bhl.part.22854.
Horton, T.; Lowry, J.; De Broyer, C.; Bellan-Santini, D.; Copilaș-Ciocianu, D.; Corbari, L.; Costello, M.J.; Daneliya, M.; Dauvin, J.-C.; Fišer, C.; Gasca, R.; Grabowski, M.; Guerra-García, J.M.; Hendrycks, E.; Hughes, L.; Jaume, D.; Jazdzewski, K.; Kim, Y.H.; King, R.; Krapp-Schickel, T.; LeCroy, S.; Lörz, A.-N.; Mamos, T.; Senna, A.R.; Serejo, C.; Souza-Filho, J.F.; Tandberg, A.H.; Thomas, J.D.; Thurston, M.; Vader, W.; Väinölä, R.; Valls Domedel, G.; Vonk, R.; White, K. & Zeidler, W. 2026. World Amphipoda Database. Protohyale Bousfield & Hendrycks, 2002. https://www.marinespecies.org/aphia.php?p=taxdetails&id=236513. Access: 05/02/2026.
Hughes, L.E. & Lowry, J.K. 2006. New species of Amphipoda (Crustacea: Peracarida) from the Solitary Islands, New South Wales, Australia. Zootaxa, 1222(1): 1-52. https://doi.org/10.11646/zootaxa.1222.1.1.
Iwasa-Arai, T.; Siqueira, S.G.L.; Segadilha, J.L. & Leite, F.P.P. 2021. The unique Amphipoda and Tanaidacea (Crustacea: Peracarida) associated with the brown algae Dictyota sp. from Trindade Island, Southwestern Atlantic, with biogeographic and phylogenetic insights. Frontiers in Marine Science, 8: 1-30, 641236. https://doi.org/10.3389/fmars.2021.641236.
Leite, F.P.P. 2011. Amphipoda. In: Amaral, A.C.Z. & Nallin, S.A.H. (Orgs.). Biodiversidade e ecossistemas bentônicos marinhos do litoral Norte de São Paulo Susteste do Brasil. Campinas, SP, UNICAMP/IB. p. 327-333.
Leite, F.P.P.; Siqueira, S.G.L.; Oliveira, D.A.; Hoff, C.; Requel, A.C.; Brumatt, P.N. & Corbo, M.C. 2011. Peracáridos dos substratos biológicos de costões rochosos. In: Amaral, A.C.Z. & Nallin, S.A.H. (Orgs.). Biodiversidade e ecossistemas bentônicos marinhos do litoral Norte de São Paulo Susteste do Brasil, Campinas, SP, UNICAMP/IB. p. 327-333.
Leite, F.P.P.; Bottcher, C.; Lewinsohn, I.D.A.; Siqueira, S.G.L.; Mansur, K.F.R.; Longo, P.A.S. & Vieira, E.A. 2021. Asymmetric effects of changes in the habitat-forming algae Sargassum on different associated mobile faunas along São Paulo coast, Brazil. Marine Ecology, 42: 1-15, e12649. https://doi.org/10.1111/maec.12649.
Leite, F.P.P.; Güth, A.Z. & Jacobucci, G.B. 2000. Temporal comparison of gammaridean amphipods of Sargassum cymosum on two rocky shores in southeastern Brazil. Nauplius, 8(2): 227-236. https://crustacea.org.br/wp-content/uploads/2014/02/nauplius-v08n2a07.Leite_.et_.al_.pdf.
Oliveira, L.P.H. 1953. Crustacea Amphipoda do Rio de Janeiro. Memórias do Instituto Oswaldo Cruz, 51: 289-376. https://doi.org/10.1590/S0074-02761953000100009.
Paz-Rios, C.E.; Simões, N. & Ardisson, P. 2013. Records and observations of amphipods (Amphipoda: Gammaridea and Corophiidea) from fouling assemblages in the Alacranes Reef, southern Gulf of Mexico. Marine Biodiversity Records, 6: 1-16, e90. https://doi.org/10.1017/S175526721300064X.
Rathke, H. 1836. Zur Fauna der Krym. Mémoires de l’Académie Impériale des Sciences de Saint Pétersbourg, 3(3-4): 291-454, pls. 1-10.
Raut, S.; Prakash, S.; Arjunan, V. & Kumar, A. 2022. A new species of the genus Protohyale Bousfield & Hendrycks, 2002 (Crustacea, Amphipoda, Hyalidae) from Covelong, Chennai, India. Zootaxa, 5205(6): 563-574. https://doi.org/10.11646/zootaxa.5205.6.4.
Schellenberg, A. 1938. Litorale Amphipoden des tropischen Pazifiks. Kungliga Svenska Vetenskapsakademiens Handlingar, Ser. 3, 16(6): 1-105.
Serejo, C.S. 1999. Taxonomy and distribution of the family Hyalidae (Amphipoda, Talitroidea) on the Brazilian coast. In: Schram, F.R. & von Vaupel Klein, J.C. (Eds.). Crustaceans and the biodiversity crisis. Leiden, Brill. p. 591-616. https://doi.org/10.1163/9789004630543_047.
Serejo, C.S. 2001. A new species of amphipod from the Brazilian coast, with redescription of Hyale spinidactyla Chevreux, 1925 (Crustacea, Amphipoda, Hyalidae). Zoosystema, 23(3): 479-492.
Serejo, C.S. & Siqueira, S.G.L. 2018. Catalogue of the Order Amphipoda from Brazil (Crustacea, Peracarida): Suborders Amphilochidea, Senticaudata and Order Ingolfiellida. Zootaxa, 4431(1): 1-139. https://doi.org/10.11646/zootaxa.4431.1.1.
Stebbing, T.R.R. 1897. Amphipoda from the Copenhagen Museum and other sources. Transactions of the Linnean Society of London, Zoology, Ser. 2, 7: 25-45. https://doi.org/10.1111/j.1096-3642.1897.tb00400.x.
Stebbing, T.R.R. 1899. Amphipoda from the Copenhagen Museum and other sources, part II. Transactions of the Linnean Society of London, Zoology, Ser. 2, 8: 395-432, pls. 30-35. https://doi.org/10.1111/j.1096-3642.1899.tb00202.x.
Stebbing, T.R.R. 1906. Amphipoda. I. Gammaridea. Das Tiereich, 21, 1-806, 127 figs.
Stout, V.R. 1913. Studies in Laguna Amphipoda. Zoologische Jahrbucher. Abteilung fur Systematik, Okologie und Geographie der Tiere, 34: 633-659. https://doi.org/10.5962/bhl.part.19898.
Tavares, M. & Mendonça, J.B. 2022. Brachyuran crabs (Crustacea, Decapoda) from the remote oceanic Archipelago Trindade and Martin Vaz, South Atlantic Ocean. Zootaxa, 5146(1): 1-129. https://doi.org/10.11646/zootaxa.5146.1.1.
Watling, L. 1989. A classification of crustacean setae based on the homology concept. In: Felgenhauer, B.E.; Thistle, A.B. & Watling, L. (Eds.). Functional morphology of feeding and grooming in Crustacea. London, CRC Press. p. 15-26. https://doi.org/10.1201/9781003079354.
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Copyright (c) 2026 Elkênita Guedes-Silva, Jesser Fidelis Souza-Filho, Marcos Tavares
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Conselho Nacional de Desenvolvimento Científico e Tecnológico
Grant numbers 150382/2025-1;307767/2025-6;443278/2019-9;441794/2024-6;443955/2024-7;309488/2020-6
