The 22 recognized species in this genus are: •
Hydrolagus affinis (
Brito Capello (
pt), 1868) (small-eyed rabbitfish) •
Hydrolagus africanus (
Gilchrist, 1922) (African chimaera) •
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) •
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. ==References==