Plotosaurus was a mosasaur, a type of marine reptile related to lizards and snakes. It was not a dinosaur. Plotosaurus lived during the Late Cretaceous, with fossils found in North America, Asia and South America.

All the Plotosaurus illustrations below were collected from the internet. Enjoy and explore:

Plotosaurus was described by the following scientific paper(s):
  • C. J. Hesse and S. P. Welles. 1936. The first record of a dinosaur from the West Coast. Science 84(2172):157-158
  • C. L. Camp. 1942. California mosasaurs. Memoirs of the University of California 13(1):1-68
  • E. Frey, E. W. A. Mulder, and W. Stinnesbeck, C. Salazar, L. A. H. Quinzio-Sinn. 2016. A mosasaur, cf. Plotosaurus, from the upper Maastrichtian Quiriquina Formation in Central Chile. Cretaceous Research 61:17-25