The species are grouped into two genera and include: •
Hydrolagus homonycteris Didier, 2008 (black ghostshark) •
Hydrolagus lemures (
Whitley, 1939) (bight ghostshark) •
Hydrolagus lusitanicus T. Moura,
I. M. R. Figueiredo,
Bordalo-Machado,
C. Almeida &
Gordo, 2005 (Portuguese rabbitfish) •
Hydrolagus macrophthalmus F. de Buen, 1959 (big-eyed chimaera) •
Hydrolagus marmoratus Didier, 2008 (marbled ghostshark) •
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) (spookfish) •
Hydrolagus novaezealandiae (
Fowler, 1911) (dark ghostshark) •
Hydrolagus ogilbyi (
Waite, 1898) (Ogilby's ghostshark) •
Hydrolagus pallidus Hardy &
Stehmann, 1990 (pale chimaera) •
Hydrolagus purpurescens (
C. H. Gilbert, 1905) (purple chimaera) •
Hydrolagus trolli Didier &
Séret, 2002 (pointy-nosed blue chimaera) •
Hydrolagus waitei Fowler, 1907 •
Hydrolagus sp. D/G (giant black chimaera) •
Hydrolagus sp. F (Peruvian rabbitfish) • †
Canadodus Popov, Johns & Suntok, 2020
Sooke Formation, Canada,
Oligocene == References ==