Hydrolagus is a genus of fish in the family Chimaeridae found in the Atlantic, Indian and Pacific Oceans.Weigmann, S. (2016): Annotated checklist of the living sharks, batoids and chimaeras (Chondrichthyes) of the world, with a focus on biogeographical diversity. Journal of Fish Biology, 88 (3): 837-1037.
Species The 22 recognized species in this genus are: Hydrolagus affinis (Brito Capello (pt), 1868) (small-eyed rabbitfish) Hydrolagus africanus (Gilchrist, 1922) (African chimaera) Walovich, K.A., Ebert, D.A., Long, D.J. & Didier, D.A. (2015): Redescription of Hydrolagus africanus (Gilchrist, 1922) (Chimaeriformes: Chimaeridae), with a review of southern African chimaeroids and a key to their identification. African Journal of Marine Science, 37 (2): 157-165. Hydrolagus alberti Bigelow & Schroeder, 1951 (gulf chimaera) Hydrolagus alphus Quaranta, Didier, Long & Ebert, 2006 (whitespot ghost shark) Hydrolagus barbouri (Garman, 1908) (ninespot chimaera) Hydrolagus bemisi Didier, 2002 (pale ghostshark) Hydrolagus colliei (G. T. Lay & E. T. Bennett, 1839) (spotted ratfish) Hydrolagus eidolon D. S. Jordan & C. L. Hubbs, 1925 (Niji Chimaera) Hydrolagus erithacus Walovich, Ebert & Kemper, 2017 (Robin's ghostshark) Walovich, K.A., Ebert, D.A. & Kemper, J.M. (2017): Hydrolagus erithacus sp. nov. (Chimaeriformes: Chimaeridae), a new species of chimaerid from the southeastern Atlantic and southwestern Indian oceans. Zootaxa, 4226 (4): 509–520. Hydrolagus homonycteris Didier, 2008 (black ghostshark) Hydrolagus lusitanicus T. Moura, I. M. R. Figueiredo, Bordalo-Machado, A. C. Almeida & Serrano-Gordo, 2005 (Portuguese chimaera) Hydrolagus macrophthalmus F. de Buen, 1959 (bigeye chimaera) Hydrolagus marmoratus Didier, 2008 (marbled ghost shark) Hydrolagus matallanasi Soto & Vooren, 2004 (striped rabbitfish) Hydrolagus mccoskeri L. A. K. Barnett, Didier, Long & Ebert, 2006 (Galápagos ghostshark) Hydrolagus melanophasma K. C. James, Ebert, Long & Didier, 2009 (Eastern Pacific black ghostshark) Hydrolagus mirabilis (Collett, 1904) (large-eyed rabbitfish) Hydrolagus mitsukurii (D. S. Jordan & Snyder, 1904) (Mitsukuri's chimaera) Hydrolagus novaezealandiae (Fowler, 1911) (dark ghostshark) Hydrolagus pallidus Hardy & Stehmann, 1990 (pale chimaera) Hydrolagus purpurescens (C. H. Gilbert, 1905) (purple chimaera) Hydrolagus trolli Didier & Séret (fr), 2002 (abyssal ghostshark) Fossil remains of the genus are known from the Miocene and Pliocene of California.Popov, E. V., and G. T. Takeuchi. 2011. Miocene–early Pliocene chimaeroid fishes (Holocephali, Chimaeroidei) from California and a review of the global Neogene chimaeroid diversity and distribution. Journal of the Vertebrate Paleontology 31(Program and Abstracts):175.
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