Temporal range: Late Cretaceous
|An illustration of Plesiopleurodon.|
Plesiopleurodon, name meaning "near sided tooth", is an extinct genus of pliosaur which existed during the late Cretaceous period in North America. It was named by Carpenter based upon a complete skull and lower jaws, neck vertebrae, and a right coracoid.
This species is characterized by a long symphasis containing eight pairs of teeth, which were circular in cross section and smooth on the outside apart from near the base. It also had ribs of the neck vertebrae which were single-headed, unlike the earlier Jurassic pliosaurs' which were double-headed, and a long slender interpectoral bar on the coracoid.