Hydrolagus Gill, 1863
First dorsal fin with a strong spine, either completely free from the front margin of the fin, or joined to it along its whole length; anal fin continuous with caudal fin; caudal fin with or without a filament at its tip.
See family for biology, etc.
Species about 15; in Clofnam area 2.
Recent revisions: Bigelow and Schroeder (1953).
Species of this genus in the program:
Hydrolagus affinis
Hydrolagus mirabilis