Known from isolated teeth only, Cappetta (1987:48) similarly defines the genus and noted that the conule count may vary between 4-7 and that these teeth are less mesio-distally elongated relative to Hexanchus. He included three representative species: * (PICTET 1865) (Lower Cretaceous) Southern France * (AGGASSIZ 1834b) Oligocene-Miocene of North America, Europe, and Australia * (AGASSIZ 1843b) , England Two additional species as present in the Chesapeake region:
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