Type specimen in the Peabody Museum, with restored skull[1]
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Dinosauria
Clade:
†Ornithischia
Clade:
†Ornithopoda
Clade:
†Hadrosauromorpha
Genus:
†Claosaurus Marsh, 1890
Type species
†Hadrosaurus agilis
(Marsh, 1872a) Marsh, 1890
Synonyms
Hadrosaurus agilis Marsh, 1872a
Thespesius agilis (Marsh, 1872a) Hay, 1902
Trachodon agilis (Marsh, 1872a) Kuhn, 1936
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 Hadrosauria.[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.
the specimen in 1900, referred to it as Claosaurus, because E. annectens was thought to be a species of Claosaurus at the time. Additionally, it is more...
time, following Marsh's death in 1899, Claosaurus annectens was variously classified as a species of Claosaurus, Thespesius, or Trachodon. Opinions varied...
Anatotitan, Claosaurus, Hadrosaurus, Thespesius, and Trachodon, with references predating the 1980s typically using Anatosaurus, Claosaurus, Thespesius...
Omeisaurus Apatosaurus Barosaurus Dicraeosaurus Seismosaurus The belief that Claosaurus had a gizzard has been discredited on the grounds that the fossil remains...
close association with the fossil remains of the duck-billed hadrosaur Claosaurus and interpreted it as gastroliths. Brown was among the first paleontologists...
Probactrosaurus but less derived than Hadrosauridae. The exclusion of Claosaurus, Jeyawati, Levnesovia, Nanyangosaurus, Shuangmiaosaurus and Telmatosaurus...
Artist's impression of a Cretoxyrhina and two Squalicorax circling a dead Claosaurus in the Western Interior Seaway Elasmosaurus platyurus in the Rocky Mountain...
Leidy, 1858 (the type genus and species of Hadrosauridae Cope, 1869) and Claosaurus agilis Marsh, 1872 (Dinosauria: Ornithopoda) from the Late Cretaceous...
Othniel Charles Marsh made an endocast of a specimen then referred to Claosaurus annectens; only basic remarks were possible but it was noted that the...
first endocast of an ankylopolloxian brain, for in 1893, the skull of a Claosaurus annectens (today referred to the genus Edmontosaurus) was used by Othniel...
the other Appalachian hadrosaur Hadrosaurus and possibly Lophorhothon, Claosaurus and both species of Hypsibema, suggests that Appalachia was the ancestral...
nodosaurids Hierosaurus and Niobrarasaurus, as well as the hadrosaur Claosaurus. List of pterosaur genera Timeline of pterosaur research Hone, David;...
between 3.5 and 4 times taller than their corresponding centra. As in Claosaurus, its supraacetabular process is as long as 75% of the length of the central...
made from scavenging. Remains of partial skeletons of dinosaurs like Claosaurus and Niobrarasaurus show signs of feeding and digestion by C. mantelli...
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