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Rhomaleosaurus (Nobu Tamura)


Rhomaleosaurus (Greek for "strong lizard"); pronounced ROE-ma-LAY-oh-SORE-us


Shores of Western Europe

Historical Period:

Early Jurassic (200-195 million years ago)

Size and Weight:

About 20 feet long and 1,000-2,000 pounds


Fish, squids and aquatic reptiles

Distinguishing Characteristics:

Large head with numerous sharp teeth


About Rhomaleosaurus:

Thanks to the discovery of numerous intact fossils, Rhomaleosaurus is one of the best-known pliosaurs of the early Jurassic period. In fact, this is one of those select marine reptiles (like the poster genus for the mosasaurs that succeeded the plesiosaurs and pliosaurs, Mosasaurus) that was dug up before its time: a complete Rhomaleosaurus skeleton was found by miners in Yorkshire, England in 1848, and must have given them quite a scare.

With its large head, sharp teeth and powerfully muscled body, the 20-foot-long Rhomaleosaurus was one of the most dangerous predators of its day, feeding on fish, squids, and smaller marine reptiles that crossed its path. This pliosaur also seems to have possessed an impressive sense of smell, picking up the scent of nearby prey as it funneled water through its nostrils.


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