How is the sixgill shark classified?

The sixgill shark, belonging to the genus Hexanchus, is classified within the family Hexanchidae, which includes the cow sharks. Its scientific name is Hexanchus griseus. This species is characterized by its six gill slits, a trait that distinguishes it from most modern sharks, which typically have five. Sixgill sharks inhabit deep waters and are known for their primitive features, linking them to ancient shark lineages.