| Claosaurus Temporal range: Late Cretaceous,
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| Type specimen in the Peabody Museum, with restored skull[1] | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Neornithischia |
| Clade: | †Ornithopoda |
| Clade: | †Hadrosauromorpha |
| Genus: | †Claosaurus Marsh, 1890 |
| Type species | |
| †Hadrosaurus agilis (Marsh, 1872a) Marsh, 1890
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| Synonyms | |
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Claosaurus (/ˌkleɪəˈsɔːrəs/ KLAY-ə-SOR-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 hadrosauroid dinosaur that lived during the Late Cretaceous Period (Santonian-Campanian).[2]
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 non-hadrosaurid relative of true hadrosaurids within the clade Hadrosauromorpha.[3]
- ^ "Claosaurus agilis".
- ^ Doran, Brownstein C. (2021). Dinosaurs from the Santonian–Campanian Atlantic coastline substantiate phylogenetic signatures of vicariance in Cretaceous North America. R. Soc. Open Sci. 8: 210127. https://doi.org/10.1098/rsos.210127
- ^ Prieto-Márquez, A. (2011). "Revised diagnoses of Hadrosaurus foulkii Leidy, 1858 (the type genus and species of Hadrosauridae Cope, 1869) and Claosaurus agilis Marsh, 1872 (Dinosauria: Ornithopoda) from the Late Cretaceous of North America". Zootaxa. 2765: 61–68. doi:10.11646/zootaxa.2765.1.6.