Full reference: J. Evans and T. S. Kemp. 1976. A new turtle skull from the Purbeckian of England and a note on the early dichotomies of cryptodire turtles. Palaeontology 19(2):317-324
Sister taxon: Dorsetochelys buzzops
Type specimen: DORCM G.23, a skull (a complete skull). Its type locality is Durlston Bay unspecified [Sit Charles Richardson Collection], which is in a Berriasian lagoonal/restricted shallow subtidal horizon in the United Kingdom.