File:North American Plesiosaurs Elasmosaurus, Cimoliasaurus, and Polycotylus17.png
![File:North American Plesiosaurs Elasmosaurus, Cimoliasaurus, and Polycotylus17.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/North_American_Plesiosaurs_Elasmosaurus%2C_Cimoliasaurus%2C_and_Polycotylus17.png/366px-North_American_Plesiosaurs_Elasmosaurus%2C_Cimoliasaurus%2C_and_Polycotylus17.png?20140818191628)
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