What are the ichthyosaurus and plesiosaurus?

Answer 1

Plesiosaurs and icthyosaurs were two unrelated groups of marine reptiles that lived during the Mesozoic. Plesiosaurs had long necks and short tails, or short necks and long tails, and they propelled themselves using their flippers. Icthyosaurs were reptiles that looked much like fish, with a long narrow snout, and a vertical tail fin. Both plesiosaurs and icthyosaurs ate marine animals.

Answer 2

Icthyosaurs and plesiosaurs were fully aquatic. There were no groups of fully aquatic dinosaurs. Therefor, icthyosaurs and plesiosaurs weren't dinosaurs. Instead, they each belonged to their own order in the Reptilia class.

Answer 3

Icthyosaurs were marine reptiles that looked like fish. They had fins, including a vertical tail fin.

Plesiosaurs were marine reptiles that had both long and short necked types. Long necked types had round bodies, short tails, flippers, and long necks with a small head. Short necked types propelled themselves with flippers, but they had large, alligator-like heads.