Helicoprion

General Background
Their are 8 species of Helicorpion with H. bessonovi the type species.The fossil remains of the genus are found in western Australia,China and western North America.Despite it's looks,it is not a shark,it is a Agassizodontid(commonly known as whorltooths)Eugeneodontid.These fish are actually more closely related to chimaeras than sharks,their closest living relatives are ratfish.