Main Page | See live article | Alphabetical index Plesiosaurs were large carnivorous marine reptiles that lived during the Mesozoic period. Despite being large reptiles, they were not a type of dinosaur. There are two major kinds of plesiosaur. One type is characterized by having a large head and a short neck, and are known as pliosaurs. The largest pliosaurs, such as Kronosaurus, had skulls 3 metres long with huge pointed teeth. Pliosaurs were predators that fed on other marine reptiles. The other group of plesiosaurs were small-headed and long-necked. Of the latter group there are three kinds: the plesiosaurid, the cryptoclidids and the elasmosaurs. Most fed on fish and molluscs. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.