Holotype specimen of C. nasicornis
The first specimen, holotype USNM 4735, was discovered and excavated by farmer Marshall Parker Felch in 1883 and 1884. Found in articulation, with the bones still connected to each … See more

In his original description of the Ceratosaurus nasicornis holotype and subsequent publications, Marsh noted a number of characteristics that were unknown in all other theropods known at the time. Two of these features, the fused pelvis and fused … See more

All North American Ceratosaurus finds come from the Morrison Formation, a sequence of shallow marine and (predominantly) alluvial sedimentary rocks in the western United States and the most fertile source for dinosaur bones of the continent. … See more

Ceratosaurus followed the body plan typical for large theropod dinosaurs. As a biped, it moved on powerful legs, while its arms were reduced in size. Specimen USNM 4735, the first discovered skeleton and holotype of Ceratosaurus nasicornis, was an individual 5.3 … See more

Ecology and feeding
Within the Morrison and Lourinhã Formation, Ceratosaurus fossils are frequently found in … See more

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