A Second New Theropod Dinosaur from the Late Jurassic of East Central Utah

Abstract

Marshosaurus bicentesimus (Reptilia: Saurischia), a new theropod dinosaur from the Late Jurassic Morrison Formation of east central Utah, is distinct from other Morrison theropods, Allosaurus, Ceratosaurus, and Stokesosaurus, of the Cleveland-Lloyd Dinosaur Collection in the unusual character of the type specimen, a left ilium, and in the referred materials, which include the toothbearing elements of the skull and jaw and the complete pelvic girdle. A relatively complete, articulated skeleton of Marshosaurus is unknown at this time.