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Colorado blade sizes8/9/2023 ![]() Fragmentary remains have also been reported from Tanzania, Uruguay, and Switzerland, although their assignment to Ceratosaurus is currently not accepted by most paleontologists.Ĭeratosaurus was a medium-sized theropod. In 2000, a partial specimen was excavated and described from the Lourinhã Formation of Portugal, providing evidence for the presence of the genus outside of North America. In 1999, the discovery of the first juvenile specimen was reported. The validity of these additional species has been questioned, however, and all three skeletons possibly represent different growth stages of the same species. Two additional species, Ceratosaurus dentisulcatus and Ceratosaurus magnicornis, were described in 2000 from two fragmentary skeletons from the Cleveland-Lloyd Quarry of Utah and from the vicinity of Fruita, Colorado. The Garden Park specimen remains the most complete skeleton known from the genus and only a handful of additional specimens have been described since. The type species is Ceratosaurus nasicornis. ![]() The genus was first described in 1884 by American paleontologist Othniel Charles Marsh based on a nearly complete skeleton discovered in Garden Park, Colorado, in rocks belonging to the Morrison Formation. Megalosaurus nasicornis (Marsh, 1884 )Ĭeratosaurus / ˌ s ɛr ə t oʊ ˈ s ɔːr ə s/ (from Greek κέρας/κέρατος, keras/keratos meaning "horn" and σαῦρος sauros meaning "lizard") was a carnivorous theropod dinosaur that lived in the Late Jurassic period ( Kimmeridgian to Tithonian ages).
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