This taxon is considered subjective synonym of
of the valid taxon Allosaurus fragilis
according to the Paleobiology Database.
See the page for Allosaurus fragilis →
Bibliography
Original description
J. Leidy. 1870. [Remarks on Poikilopleuron valens, Clidastes intermedius, Macrosaurus proriger, Baptemys wyomingensis, and Emys stevensonianus]. Proceedings of the Academy of Natural Sciences of Philadelphia 22(1):3-5