Marine reptiles in the callovian of European Russia

The study of the remains of marine reptiles from the Callovian (Middle Jurassic) deposits of European Russia highlights the similarity of the herpetofauna of the Middle Russian Sea with the famous fauna of the Oxford Clay Formation of England. The Middle Russian Sea was inhabited by the pliosaurids Liopleurodon and Simolestes ; the cryptoclidid plesiosaurs Cryptoclidus , Muraenosaurus and Tricleidus , the crocodylomorphs Thalattosuchus and Tyrannoneustes , and the ichthyosaurs Ophthalmosaurus . Finds from Russia indicate the uniformity of the herpetofaunas of Western and Eastern European epicontinental seas in the Callovian Age.