Corosaurus

Originally described as a nothosaur,‭ ‬Corosaurus is now identified as a pistosaurid,‭ ‬a kind of sauropterygian reptile that is related to but separate to the true nothosaurs.‭ ‬The pistosauroids are established around the type genus pistosaurus,‭ ‬and it may have been these kinds of marine reptiles that were actually ancestral to the plesiosaurs that would begin to appear around the late Triassic and early Jurassic.‭

Fossils of Corosaurus have been dated to be around‭ ‬245-247‭ ‬million years old,‭ ‬which firmly places them within the early Anisian stage of the mid Triassic.‭ ‬The small size of Corosaurus indicates that members of the genus were probably predators of smaller marine organisms along the lines of fish.