Claosaurus
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Claosaurus Temporal range: Late Cretaceous, 87–82 Ma |
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| Type specimen in the Peabody Museum, with restored skull | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Dinosauria |
| Order: | †Ornithischia |
| Suborder: | †Ornithopoda |
| Superfamily: | †Hadrosauroidea |
| Genus: |
†Claosaurus Marsh, 1890 |
| Type species | |
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†C. agilis Marsh, 1872 (Originally Hadrosaurus) |
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| Species | |
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†Claosaurus agilis |
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†Claosaurus agilis
(Marsh, 1872)
†"Claosaurus affinis"
Wieland, 1903 (nomen dubium)
Claosaurus (/ˌkleɪoʊˈsɔːrəs/ KLAY-o-SAWR-əs; Greek κλάω, klao meaning 'broken' and σαῦρος, 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.
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