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Osmakasaurus; Temporal range: Valanginian, 137 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Neornithischia
Clade:	†Ornithopoda
Clade:	†Ankylopollexia
Clade:	†Styracosterna
Genus:	†Osmakasaurus; McDonald, 2011
Species:	†O. depressus
Binomial name
	†Osmakasaurus depressus; (Gilmore, 1909)
Synonyms
	Camptosaurus depressus Gilmore, 1909; Planicoxa depressa Carpenter & Wilson, 2008;

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]

References

^ ^a ^b ^c 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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[McDonald-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.

[2] 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.

[3] 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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