A genus of extinct marine lizard from the Cretaceous period, similar to modern mosasaurs.
From Greek 'klaos' (broken/lame) + 'sauros' (lizard), named for its perceived limb structure. The term was created in the 19th century as paleontologists discovered and classified prehistoric reptiles.
Claosaurus fossils were found in the Western Interior Seaway that covered North America 90 million years ago—these creatures ruled seas that no longer exist, leaving only stone records of their dominance.
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