Plesiosaurus macrocephalus, juvenile Found by Mary Anning Argentinosaurus Albertosaurus maxilla

Albertosaurus maxilla

small bones embedded in the skin

compared to 50 or 100 tons for more famous sauropod cousins like Diplodocus or Argentinosaurus

The large compound eyes are the main sensory organ of dragonflies

The white lines are representative of fractures healed with calcite in the original specimen

Plesiosaurus macrocephalus, juvenile Found by Mary Anning Argentinosaurus Albertosaurus maxillaThis 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