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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 cryptoclidid s and the elasmosaur s. Most fed on fish and molluscs.