Marine Reptiles & Ancient Seas

Marine reptiles and other animals of ancient seas occupied different periods and environments. Plesiosaurs and mosasaurs were reptiles, whereas megalodon was a shark and Dunkleosteus an armored fish. Their bodies show contrasting arrangements of fins, flippers, jaws and protective structures. Fossils reveal these distinctions and help reconstruct marine food webs. They should not be presented as one contemporaneous group or all labeled marine dinosaurs.