Abstract
A new hermit crab species of the family Paguridae is described on the basis of two male specimens from Hedo Dome, a submarine cave located on the north coast of Okinawa Island, Ryukyu Islands, southwestern Japan. The assignment of the new species to the genus Eutrichopagurus Komai, 2015 is based on the structure of the gills and right male sexual tube, the article 3 of the antennular peduncle with a prominent tuft of setae on the dorsodistal margin, and the posterior lateral margins of the telson each bearing a prominent tuft of setae. Among two known congeners, Eutrichopagurus crassoculus n. sp. may be closer to the type species of the genus, E. shirakawai Komai, 2015, in having greatly reduced corneas, basally bearing sparse setae, and no small corneous spines or spiniform setae on the dorsal surface of the meri of the ambulatory legs, but is distinguishable by the morphology of the ocular peduncles, ocular acicle, antennular peduncle, and chelipeds.
References
Asakura, A. (2000) A review of Japanese species of Pylopaguropsis Alcock, 1905 (Decapoda: Anomura: Paguridae). Crustacean Research, 29, 70–108. https://doi.org/10.18353/crustacea.29.0_70
Asakura, A. (2004) Pseudopaguristes shidarai, a new species of hermit crab (Crustacea: Decapoda: Diogenidae) from Japan, the fourth species of the genus. Proceedings of the Biological Society of Washington, 117 (2), 153–168.
Bouvier, E.L. (1897) Sur deux paguriens nouveaux trouvés par M. Coutière dans le récif madréporique, Djibouti. Bulletin du Muséum national d’Histoire naturelle, Paris, 6, 229–233.
Fujimoto, S. & Jimi, N. (2020) A new marine tardigrade genus and species (Arthrotardigrada, Styraconyxidae) with unique pockets on the legs. Zoosystematics and Evolution, 96 (1), 115–122. https://doi.org/10.3897/zse.96.49676
Fujita, Y. (2019) The fauna of decapod crustaceans in submarine caves of the Ryukyu Islands, with special reference to environmental factors in the caves. Taxa (Proceedings of the Japanese Society of Systematic Zoology), 46, 3–12. [in Japanese with English abstract]
Fujita, Y. & Naruse, T. (2011) Catoptrus iejima, a new species of cavernicolous swimming crab (Crustacea: Brachyura: Portunidae) from a submarine cave at Ie Island, Ryukyu Islands, Japan. Zootaxa, 2918 (1), 29–38. https://doi.org/10.11646/zootaxa.2918.1.3
Hayami, I. & Kase, T. (1992) A new cryptic species of Pycnodonte from Ryukyu Islands: A living fossil oyster. Transactions and Proceedings of the Palaeontological Society of Japan, New Series, 165, 1070–1089.
Hayami, I. & Kase, T. (1993) Submarine cave Bivalvia from the Ryukyu Islands: systematics and evolutionary significance. Bulletin of the University Museum, The University of Tokyo, 35, i–iv + 1–133.
Jimi, N., Fujimoto, S., Ogawa, A., Fujita, Y., Shigenobu, Y. & Imura, S. (2020) Two new species of Fauveliopsidae (Annelida, Sedentaria) from submarine caves and deep sea, Japan. Zootaxa, 4878 (2), 385–391. https://doi.org/10.11646/zootaxa.4878.2.11
Kakui, K. & Fujita, Y. (2018) Haimormus shimojiensis, a new genus and species of Pseudozeuxidae (Crustacea: Tanaidacea) from a submarine limestone cave in northwestern Pacific. Peer J, 6, e4720. https://doi.org/10.7717/peerj.4720
Kano, Y. & Kase, T. (2000) Taxonomic revision of Pisulina (Gastropoda: Neritopsina) from submarine caves in the tropical Indo-Pacific. Paleontological Research, 4 (2), 107–129.
Kase, T. (1998) The family Piekworthiidae (Gastropoda: Caenogastropoda) from tropical Pacific submarine caves: four new species of Sansonia. Venus, 57 (3), 161–172.
Komai, T. (2013) Additional records of the pagurid hermit crab genus Trichopagurus de Saint Laurent, 1968 (Crustacea: Decapoda: Anomura), with description of a new species from the Philippines. Zootaxa, 3670 (2), 274–282. http://dx.doi.org/10.11646/zootaxa.3670.2.10
Komai, T. (2015) A new genus and new species of Paguridae (Crustacea: Decapoda: Anomura) from shallow subtidal waters in Okinawa Island, the Ryukyu Islands, Japan. Zootaxa, 3918 (2), 250–260. http://dx.doi.org/10.11646/zootaxa.3918.2.6
Komai, T. & Asakura, A. (1995) Pagurixus nomurai, new species, and addition al record of Pagurixus maorus (Nobili, 1906), hermit crabs from Kume-jima Island, the Ryukyus, Japan (Decapoda: Anomura: Paguridae). Journal of Crustacean Biology, 15 (2), 341–354. https://doi.org/10.2307/1548961
Komai, T. & Fujita, Y. (2018) A new genus and new species of alpheid shrimp from a marine cave in the Ryukyu Islands, Japan, with additional record of Salmoneus antricola Komai, Yamada & Yunokawa, 2015 (Crustacea: Decapoda: Caridea). Zootaxa, 4369 (4), 575–586. https://doi.org/10.11646/zootaxa.4369.4.7
Komai, T. & Osawa, M. (2005) A new species of Trichopagurus de Saint Laurent (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, and redescription of T. trichophthalmus (Forest). Zootaxa, 801 (1), 1–20. https://doi.org/10.11646/zootaxa.801.1.1
Komai, T. & Poupin, J. (2012) Two new species of shallow-water hermit crabs (Crustacea: Decapoda: Paguridae) from Mayotte Island, southwestern Indian Ocean. Zootaxa, 3277 (1), 56–68. https://doi.org/10.11646/zootaxa.3277.1.4
Komai, T., Rahayu, D.L. & Fujita, Y. (2021) Hermit crabs of the family Paguridae (Crustacea: Decapoda: Anomura) from Christmas and Cocos (Keeling) Islands, Indian Ocean Territory of Australia, with descriptions of three new species and reappraisal of the genus Kumepagurus Komai & Osawa, 2012. Raffles Bulletin of Zoology, 69, 378–402. https://doi.org/10.26107/RBZ-2021-0059
Komai, T., Yamada, Y. & Shirakawa, N. (2010) A new hermit crab species of the genus Catapaguroides A. Milne-Edwards & Bouvier (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, Japan, and additional record of C. foresti McLaughlin. Zootaxa, 2690 (1), 32–42. https://doi.org/10.11646/zootaxa.2690.1.3
Iredale, T. (1918) Molluscan nomenclatural problems and solutions. No. 1. Proceedings of the Malacological Society of London, 13 (1–2), 28–40. https://doi.org/10.1093/oxfordjournals.mollus.a063674
Latreille, P.A. (1802) Histoire Naturelle, Générale et Particulière des Crustacés et des Insectes. Vol. 3. F. Dufart, Paris, 467 pp.
Lewinsohn, C. (1982) Aniculus retipes n. sp. ein neuer Einsiedlerkrebs aus dem Roten Meer (Decapoda, Anomura). Crustaceana, 42 (1–2), 76–82. https://doi.org/10.1163/156854082X00713
McLaughlin, P.A. (2002) A new species of the genus Catapaguroides (Decapoda: Anomura: Paguroidea: Paguridae) from Guam, Micronesia. Crustaceana, 75 (3–4), 495–504. https://doi.org/10.1163/156854002760095543
McLaughlin, P.A (2003) Illustrated keys to families and genera of the superfamily Paguroidea (Crustacea: Decapoda: Anomura), with diagnoses of genera of Paguridae. Memoirs of Museum Victoria, 60 (1), 111–144. https://doi.org/10.24199/j.mmv.2003.60.16
McLaughlin, P.A. & Haig, J. (1989) On the status of Pylopaguropsis zebra Henderson, P. magnimanus (Henderson), and Galapagurus teevanus Boone, with descriptions of seven new species of Pylopaguropsis (Crustacea: Anomura: Paguridae). Micronesica, 22 (2), 123–171.
McLaughlin, P.A., Rahayu, D.L., Komai, T. & Chan, T.-Y. (2007) A Catalog of the Hermit Crabs (Paguroidea) of Taiwan. National Taiwan Ocean University, Keelung, viii + 365 pp.
Morgan, G.J. (1992) The hermit crabs (Crustacea: Decapoda: Coenobitidae, Diogenidae, Paguridae) of Christmas and Cocos (Keeling) Islands, Indian Ocean, with description of a new species of Paguristes. Raffles Bulletin of Zoology, 49 (2), 163–174.
Naruse, T. & Fujita, Y. (2015) Lipkemera iejima, a new cavernicolous crab (Brachyura: Xanthidae) from a submarine cave at Ie Island, central Ryukyu Islands, Japan. Crustacean Research, 44, 21–27. https://doi.org/10.18353/crustacea.44.0_21
Okanishi, M. & Fujita, Y. (2018) First finding of anchialine and submarine cave dwelling brittle stars from the Pacific Ocean, with descriptions of new species of Ophiolepis and Ophiozonella (Echinodermata: Ophiuroidea: Amphilepidida). Zootaxa, 4377 (1), 1–20. https://doi.org/10.11646/zootaxa.4377.1.1
Okanishi, M. & Fujita, Y. (2019) A comprehensive taxonomic list of brittle stars (Echinodermata: Ophiuroidea) from submarine caves of the Ryukyu Islands, southwestern Japan, with a description of a rare species, Dougaloplus echinatus (Amphiuridae). Zootaxa, 4571 (1), 73–98. https://doi.org/10.11646/zootaxa.4571.1.5
Osawa, M. & Fujita, Y. (2019) Submarine cave hermit crabs (Crustacea: Decapoda: Anomura: Paguroidea) from three islands of the Ryukyu Islands, southwestern Japan. Zootaxa, 4560 (3), 463–482. https://doi.org/10.11646/zootaxa.4560.3.3
Osawa, M., Fujita, Y. & Okuno, J. (2006) Two new species of Pagurixus (Crustacea: Decapoda: Anomura: Paguridae) from submarine caves of the Ryukyu Islands, southwestern Japan. Zootaxa, 1148 (1), 27–45. https://doi.org/10.11646/zootaxa.1148.1.2
Osawa, M. & Okuno, J. (2007) New species of the genus Pylopaguropsis (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, southwestern Japan, with notes on two poorly known pagurids. Species Diversity, 12 (1), 29–46. https://doi.org/10.12782/specdiv.12.29
Saint Laurent, M. de. (1968) Révision des genres Catapaguroides et Cestopagurus et description de quatre genres nouveaux. II. Cestopagurus Bouvier (Crustacés Décapodes Paguridae). Bulletin du Muséum national d’Histoire naturelle, Paris, 2e Série, 42, 210–222.
Saito, T. & Fujita, Y. (2018) A new species of the stenopodidean shrimp genus Odontozona Holthuis, 1946 (Crustacea: Decapoda: Stenopodidea: Stenopodidae) from the Ryukyu Islands, Indo-West Pacific. Zootaxa, 4450 (4), 458–472. https://doi.org/10.11646/zootaxa.4450.4.4
Shimomura, M. & Fujita, Y. (2020) A new species of the genus Heteromysoides Băcescu, 1968 (Mysida, Mysidae) from a submarine cave on Kumejima Island, Ryukyu Islands, southwestern Japan. Proceedings of the Biological Society of Washington, 133, 49–58. https://doi.org/10.2988/20-00004
Shimomura, M., Fujita, Y. & Naruse, T. (2012) First record of the genus Thetispelecaris Gutu and Iliffe, 1998 (Crustacea: Peracarida: Bochusacea) from a submarine cave in the Pacific Ocean. Zootaxa, 3367 (1), 69–78. https://doi.org/10.11646/zootaxa.3367.1.7
Yamasaki, H., Fujimoto, S. & Tanaka, H. (2020) Three new meiobenthic species from a submarine cave in Japan: Echinoderes gama, E. kajiharai and E. uozumii (Kinorhyncha: Cyclorhagida). Journal of the Marine Biological Association of the United Kingdom, 100, 537–558. https://doi.org/10.1017/S0025315420000429