Fossilised ichthyosaur rostrum. Ichthyosaurs were a type of aquatic dinosaur. Like dolphins, they had streamlined bodies, long rostrums (snouts), powerful tails and large eyes. This rostrum, with teeth mostly intact, belongs to the ichthyosaur Leptonectes sp. and dates back to the Jurassic period (about 200-145 million years ago). Ichthyosaurs emerged 240 million years ago in the Triassic era, and became extinct 90 million years ago. Similar to modern aquatic mammals, they were thought to have evolved from terrestrial animals moving back into the water. They lived entirely in the water and were viviparous (gave birth to live young). Fossil found in Lyme Regis, Dorset, UK.
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