Marine reptiles showcase
Plesiosaurs were a group of reptiles that lived in the sea. Their body was short and flat, their neck very long, and the head was very small relatively to the body. The fore and hind limbs were long paddles that moved up and down (in a way similar to flying underwater) during swimming. The plesiosaurs had sharp teeth; they ate fish, cephalopods and other swimming sea animals. The first plesiosaurs appeared in the early Jurassic, about 190 million years ago. They existed for 125 million years and went extinct at the end of the Cretaceous.
The ichthyosaurs lived in the sea, and got their name because they looked like fish. Their bodies were round and tapering posteriorly. They had a triangular dorsal fin and a robust tail fin. The fore- and hind limbs were paddles. The ichthyosaurs had large eyes and long, narrow jaws; most of them with teeth, but some without. Their food consisted mostly of fish, cephalopods and other swimming animals. Ichthyosaurs were mostly between 3 and 5 metres long, but the largest grew to a length of 15 metres. The first ichthyosaurs appeared in the Triassic, about 240 million years ago. They existed for 160 million years and went extinct in the Cretaceous. List of contents in the marine reptiles showcase
Publisert 18. mai 2011 16:00