Stokesosaurus clevelandi Madsen, 1974

Rauhut, Oliver W. M., 2003, The interrelationships and evolution of basal theropod dinosaurs, Special papers in palaeontology 69, pp. 1-213 : 27-28

publication ID

https://doi.org/ 10.5281/zenodo.3382576

DOI

https://doi.org/10.5281/zenodo.5123194

persistent identifier

https://treatment.plazi.org/id/77323C29-FFDC-B42D-FF1C-99F3FC5FFE2A

treatment provided by

Plazi

scientific name

Stokesosaurus clevelandi Madsen, 1974
status

 

Stokesosaurus clevelandi Madsen, 1974 ; metataxon

Age . Kimmeridgian-Tithonian.

Occurrence. Morrison Formation, Utah, USA.

Diagnosis. Differs from all other Late Jurassic theropods in the presence of a sharply defined vertical ridge on the ilium above the acetabulum.

Remarks. Although Stokesosaurus clevelandi is based only on an isolated ilium from the Cleveland Lloyd Quarry in the Morrison Formation of Utah ( Madsen 1974), the specimen is distinct from all other Jurassic theropods. In the original description, Madsen (1974) also referred a premaxilla to the same species, and just recently, Chure and Madsen (1998) described a braincase from the type locality as IStokesosaurus . Although the braincase in particular may well be referable to Stokesosaurus , this assignment is not accepted here, since there is no information about the association of these remains, and the Cleveland Lloyd Quarry has yielded thousands of theropod bones of at least four different species (Chure and Madsen 1998).

Despite its fragmentary nature, Stokesosaurus clevelandi is of considerable interest since the type ilium and referred ilia ( Madsen 1974) show many similarities to tyrannosaurids, a group that is otherwise only known from the Cretaceous. Therefore, Stokesosaurus is included in the analysis, although only a few characters can be coded for this taxon.

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Dinosauria

Family

Allosauridae

Genus

Stokesosaurus

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