Reptilia - Ichthyosauria - Ophthalmosauridae

Alternative combination: Grendelius mordax

Full reference: C. McGowan. 1976. The description and phenetic relationships of a new ichthyosaur genus from the Upper Jurassic of England. Canadian Journal of Earth Sciences 13(5):668-683

Belongs to Brachypterygius according to M. W. Maisch 2010

Sister taxa: Brachypterygius cantabrigiensis, Brachypterygius extremus, Brachypterygius pseudoscythicus, Brachypterygius zhuravlevi

Type specimen: J68516, a partial skeleton (complete skull with some postcranial elements). Its type locality is Great Ouse Flood Relief Channel at Stowbridge, which is in a Kimmeridgian marine horizon in the Kimmeridge Clay Formation of the United Kingdom.

Ecology: nektonic carnivore