Family Hexanchidae

Heptranchias - The sharpnose sevengill shark, Heptranchias perlo, is a species of shark in the family Hexanchidae, and the only species in the genus Heptranchias.

Hexanchus - See text.

Notorynchus - The broadnose sevengill shark, Notorynchus cepedianus, is the only extant member of the genus Notorynchus, in the family Hexanchidae.