Pliosauroidea Humerus bone cross section replaced by Pyrite-
Volga RIver, Village of Gorodishche, Ulyanovsk, Russia.
3.5″ across
Pliosauroidea is an extinct clade of marine reptiles. Pliosauroids, also commonly known as pliosaurs, are known from the Jurassic and Cretaceous Periods. The Pliosauroids were short-necked plesiosaurs with large heads and massive toothed jaws. These swimming reptiles were not dinosaurs, but distant cousins of modern turtles.
