kronosaurus was a marine reptile that lived in the ocean during the early cretaceous period when dinosaurs.

ammonite ammonites ammonoidea ancient animal aquatic background cameroceras carnivore clam clams creature cretaceous dino dinosaur dinosaurs early environment evolution extinct extinction giant huge illustration isolated kronosaurus large life lived lizard marine mollusc mollusk natural nature nautilus ocean organism paleontology period powerful prehistoric realistic reptile sea shell spiral swim teeth tentacles that underwater was water when white wild wildlife