Abstract
The pontoniine shrimp genus Onycocaris Nobili, 1904 currently contains 18 species, all known from the Indo-WestPacific. In this study, a new species of the genus, O. hayamaensis, is described and illustrated on the basis of fourovigerous female and three male specimens collected from Sagami Bay, central Japan, at shallow subtidal depths of5–6 m. The specimens lived in internal cavities of an unidentified species of a haliclonid sponge, Haliclona sp. Thisnew species is referred to the O. quadratophthalma (Balss, 1921) species group, represented by four species, i.e., O.balssi Bruce, 2011, O. fujinoi Bruce, 2011, O. quadratophthalma, and O. trullata Bruce, 1978. Differentiatingcharacters between the new species and the latter four species are discussed. The present new species exhibits strongsexual dimorphism in the second pereopods and heterochaely in the male second pereopods, though these traits are notfully documented in some of other congeneric species. Diagnostic characters derived from the second pereopods should be treated carefully.References
Balss, H. (1921) Results of Dr. E. Mjöbergs Swedish Scientific Expeditions to Australia 1910–13. XXIX: Stomatopoda, Macrura, Paguridea und Galatheidea. Kungliga Svenska Vetenskapsakademiens Handlinger, 61, 1–24.
Bruce, A.J. (1971) Notes on some Indo-Pacific Pontoniinae. XVI. Onycocaris seychellensis sp. nov., a new species of shrimp from Mahé. Crustaceana, 20, 208–218.
Bruce, A.J. (1978) A report on a collection of pontoniine shrimps from Madagascar and adjacent seas. Zoological Journal of the Linnean Society, 62, 205–290.
Bruce, A.J. (1980) On some pontoniine shrimps from Nouméa, New Caledonia. Cahiers de l'Indo-Pacifique, 2, 1–9, figs 1–14.
Bruce, A.J. (1992) Additions to the marine caridean fauna of Hong Kong, with a description of a new species of Onycocaris (Crustacea: Decapoda: Palaemonidae) from Tuvalu. In: Morton, B. (ED.) The Marine Flora and Fauna of Hong Kong and Southern China III. Proceedings of the Fourth International Marine Biological Workshop: The Marine Flora and Fauna of Hong Kong and Southern China, Hong Kong, 11–29 April 1989, 329–343.
Bruce, A.J. (2011a) Notes on some Indo-Pacific Pontoniinae, XLVIII. Onycocaris nieli sp. nov., a new pontoniine shrimp from Heron Island, Queensland. Crustaceana, 84, 319–330.
Bruce, A.J. (2011b) Notes on some Indo-Pacific Pontoniinae, XLIX. Onycocaris balssi sp. nov., from northern Australia, with the designation of O. fujinoi sp. nov. Crustaceana, 84, 477–490.
Bruce, A.J. (2012) Onycocaris longirostris Bruce, 1980 (Crustacea: Decapoda: Pontoniinae), new to the Australian fauna. Zootaxa, 3299, 61–65.
Bruce, A.J. & Coombes, K.E. (1995) The palaemonoid shrimp fauna (Crustacea: Decapoda: Caridea) of the Cobourg Peninsula, Northern Territory. The Beagle, Records of the Museums and Art Galleries of the Northern Territory, 12, 101–144.
Chace, F.A., Jr. & Bruce, A.J. (1993) The caridean shrimps (Crustacea: Decapoda) of the Albatross Philippine Expedition 1907–1910, Part 6: Superfamily Palaemonoidea. Smithsonian Contributions to Zoology, 543, i–vii, 1–152.
De Grave, S. & Fransen, C.H.J.M. (2011) Carideorum Catalogus: the Recent species of the dendrobranchiate, stenopodidean, procarididean and caridean shrimps (Crustacea: Decapoda). Zoologische Mededelingen, 85, 195–588.
Fujino, T. & Miyake, S. (1969) Studies on the genus Onycocaris with descriptions of five new species (Crustacea, Decapoda, Palaemonidae). Journal of the Faculty of Agriculture, Kyushu University, 15, 403–448.
Hayashi, K. (2003) Shrimps and lobsters from Japan (127). Family Palaemonidae, subfamily Pontoniinae – Genus Onycocaris. Aquabiology, 144, 21–26.
Holthuis, L.B. (1952) The Decapoda of the Siboga Expedition, Part XI. The Palaemonidae collected by the Siboga and Snellius Expeditions with remarks on other species, Part II: Subfamily Pontoniinae. Siboga Expeditie, 39a10: 1–254.
Kingsley, J.S. (1879) List of the North American Crustacea belonging to the suborder Caridea. Bulletin of the Essex Institute, 10, 53–71.
Marin, I. (2005) Pontoniine shrimps (Crustacea, Decapoda, Pontoniinae) from Viet Nam. Onycocaris temiri sp. n., a new sponge-associated shrimp from Nha Trang Bay. Arthropoda Selecta, 13, 113–122.
Miyake, S. (1982) Japanese Crustacean Decapods and Stomatopods in Color. Vol. I. Macrura, Anomura and Stomatopoda. Hoikusha Publishing Co., Ltd., Osaka, 261 pp., 56 pls. [in Japanese]
Nobili, G. (1904) Diagnoses préliminaire de vingt-huit espèces de Stomatopodes et Décapodes Macroures de la Mer Rouge. Bulletin du Muséum national d’Histoire naturelle, Paris, 10, 228–238.
Rafinesque, C.S. (1815) Analyse de la Nature ou Tableau de l’Univers et des corps organisés. Palerme, 224 pp. (not seen)