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meaning: "Broken lizard"
Named By: Othniel Charles Marsh in 1890
Time Period: Late Cretaceous, 87-82 Ma
Location: USA, Kansas - Niobrara Formation, Montana - Pierre Shale Formation, South Dakota - Pierre Shale Formation, Texas - Aguja Formation
Size: Roughly about 3.5 meters long
Diet: Herbivore
Fossil(s): Partial remains of a few individuals
Classification: | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hadrosauroidea |
Also known as: | Hadrosaurus agilis |

Claosaurus ( KLAY-o-SAWR-as; Greek klao, klao meaning 'broken' and sauros, sauros meaning 'lizard'; "broken lizard", referring to the odd position of the fossils when discovered) is a genus of primitive hadrosaurian (early duck-billed dinosaur) that lived during the Late Cretaceous Period (Campanian).

Traditionally classified as an early member of the family Hadrosauridae, a 2008 analysis found Claosaurus agilis to be outside of the clade containing Hadrosaurus and other hadrosaurids, making it the closest not-hadrosaurid relative of true hadrosaurids within the clade Hadrosauria.

Read more about Claosaurus at Wikipedia
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