The Japanese roughshark, Oxynotus japonicus, is a rare species of shark in the family Oxynotidae, known only from a handful of specimens recovered from Suruga Bay and the Enshunada Sea off Japan.
The sailfin roughshark (Oxynotus paradoxus) is a species of dogfish shark in the family Oxynotidae, found in the eastern North Atlantic from Scotland to Senegal between latitudes 41°N and 11°N, at depths of between 265 and 720 m (869 and 2362 ft).