Full reference: D. S. Brown. 1981. The English Upper Jurassic Plesiosauroidea (Reptilia) and a review of the phylogeny and classification of the Plesiosauria. Bulletin of the British Museum (Natural History) 35(4):253-347
Sister taxa: none
Type specimen: BMNH R8431, a partial skull. Its type locality is Endcombe Bay, which is in a Kimmeridgian marine horizon in the Kimmeridge Clay Formation of the United Kingdom.
Ecology: aquatic carnivore