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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Subsectio: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauria
Ordo: †Ornithischia
Cladus: †Genasauria
Cladus: †Neornithischia
Cladus: †Cerapoda
Cladus: †Ornithopoda
Cladus: †Iguanodontia
Genus: Osmakasaurus
Species: O. depressus

Osmakasaurus McDonald, 2011

Type species: Camptosaurus depressus Gilmore, 1909

McDonald, A.T. 2011: The taxonomy of species assigned to Camptosaurus (Dinosauria: Ornithopoda). Zootaxa 2783: 52–68. Abstract

Osmakasaurus (meaning "canyon lizard", ósmaka meaning "canyon" in the Lakota language) is a genus of herbivorous iguanodontian dinosaur. It is a basal iguanodontian which lived during the Early Cretaceous period (Valanginian age) in what is now Buffalo Gap of South Dakota, United States. It is known from the Chilson Member of the Lakota Formation. This genus was named by Andrew T. McDonald in 2011 and the type species is O. depressus.[1]
Discovery and naming

The holotype, USNM 4753, was discovered by Nelson Horatio Darton in 1896 within a layer of the Lakota Formation. The type species O. depressus was previously referred to as Camptosaurus depressus, and was first described in 1909 by Charles W. Gilmore.[2][1] It was assigned to the genus Planicoxa as Planicoxa depressa in 2008.[3] In 2011, it was assigned to the new genus Osmakasaurus.[1]

Andrew T. McDonald (2011). "The taxonomy of species assigned to Camptosaurus (Dinosauria: Ornithopoda)" (PDF). Zootaxa. 2783: 52–68. doi:10.11646/zootaxa.2783.1.4.
Gilmore, C.W. (1909). "Osteology of the Jurassic reptile Camptosaurus, with a revision of the species of the genus, and description of two new species". Proceedings of the U.S. National Museum. 332.
Carpenter, K.; Wilson, Y. (2008). "A New Species of Camptosaurus (Ornithopoda: Dinosauria) from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument, Utah, and a Biomechanical Analysis of Its Forelimb". Annals of Carnegie Museum. 76 (4): 227. doi:10.2992/0097-4463(2008)76[227:ANSOCO]2.0.CO;2.


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