Osmakasaurus
From Lakota 'osmaka' (canyon) and Greek 'sauros' (lizard); meaning 'canyon lizard'.
Osmakasaurus is a genus of iguanodontian dinosaur which lived in the Early Cretaceous (Valanginian age) Chilson Member of the Lakota Formation in what is now Buffalo Gap of South Dakota, United States. This genus was named by Andrew T. McDonald in 2011 and the type species is O. depressus.
Diagnosis
- Cranial end of preacetabular process of ilium modified into horizontal boot
- Straight dorsal margin of ilium
- Dorsal margin of ilium thickens mediolaterally towards the M. iliocaudalis platform
Species
Osmakasaurus depressus (Gilmore, 1909)
Type species
First named as Camptosaurus depressus
From Latin 'depressus' (flattened/depressed); originally coined by Gilmore (1909) for Camptosaurus depressus, with reference to the narrowness or depressed nature of the ilia.
- Holotype
- USNM 4753 , National Museum of Natural History, Smithsonian Institution
- Material
- Fragmentary postcranium including left and right ilia
- Horizon
- Chilson Member, Lakota Formation, Berriasian–Valanginian, Early Cretaceous , 143.1–132.6 million years ago
- Locality
- Calico Canyon, South Dakota, United States
Synonyms
-
Camptosaurus depressus reassigned
Originally described as Camptosaurus depressus by Gilmore (1909); reassigned to the new genus Osmakasaurus by McDonald (2011).
References
-
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 36: 197-332.
Original description as Camptosaurus depressus on the basis of an ilium-bearing specimen from the Lakota Formation of South Dakota.
gilmore1909a - McDonald, A. T. (2011). The taxonomy of species assigned to Camptosaurus (Dinosauria: Ornithopoda). Zootaxa 2783(1). Magnolia Press. doi:10.11646/zootaxa.2783.1.4 mcdonald2011a