Allosaurus lucasi

The dinosaur genus Allosaurus has a complex taxonomic history, including multiple proposed species of which only a few are considered valid today. The genus was first described in 1877 by Othniel Charles Marsh from a very fragmentary specimen found in Colorado. For several decades, Allosaurus was known under the name Antrodemus, until a 1976 publication re-established the name Allosaurus. In 2023, another, much more complete specimen found in the same quarry was selected as the neotype.