Plesiosaurus macrocephalus, juvenile Found by Mary Anning Argentinosaurus it was one of the

it was one of the three genera originally used to define Dinosauria

may have been specialized to feed on mollusks

classified it as an “indeterminate species of Homo

characteristic of herbivores

Pachycephalosaurus was one of the last non-avian dinosaurs before the Cretaceous extinction event

Plesiosaurus macrocephalus, juvenile Found by Mary Anning Argentinosaurus it was one of theThis juvenile Plesiosaur is from the Jurassic of Lyme Regis, England. It was found by Mary Anning. Plesiosaurs (meaning "near lizard") were flippered marine reptiles from the Mesozoic Era they were not dinosaurs. Plesiosaurs are divided into two groups: the Plesiosauroids with long, snake like necks, tiny heads, and wide bodies, and the Pliosauroids, which had large heads with very strong jaws and short necks. The first plesiosaur skeletons were found