Osmakasaurus

Osmakasaurus is a genus of iguanodontian dinosaur which lived in the Early Cretaceous Chilson Member of the Lakota Formation in what is now Buffalo [Gap, South Dakota|Buffalo Gap] of South Dakota, United States. This genus was named by Andrew T. McDonald in 2011 and the type species is O. depressus.

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. It was assigned to the genus Planicoxa as Planicoxa depressa in 2008. In 2011, it was assigned to the new genus Osmakasaurus.