The sharpnose sevengill shark (Heptranchias perlo), also known as one-finned shark, person shark or sevengill cow shark, is a species of shark in the family Hexanchidae, and the only living species in the genus Heptranchias. Found almost circumglobally in deep water, it is one of the few species of sharks with seven pairs of gill slits as opposed to the usual five. The other shark species with seven gill slits is the broadnose sevengill shark. Though small, this shark is an active, voracious predator of invertebrates and fishes. When caught, this species is notably aggressive and will attempt to bite. It is of minor commercial importance.