Mystriosaurus

Mystriosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic (Toarcian). Fossil specimens have been found in the Whitby Mudstone of England and Posidonia Shale of Germany. The only known species, M. laurillardi, exceeded 4 m in length.

A 2019 phylogenetic analysis found Mystriosaurus to be distinct from Steneosaurus.