Hypsirhophus (often misspelled Hypsirophus) is a dubious genus of stegosaurian dinosaurs. It contains a single species, Hypsirhophus discurus, which is known only from a fragmentary specimen. The fossil consists of partial vertebrae from the back, three from the tail, and a piece of rib.
The specimen was excavated from Edward Drinker Cope's Quarry 3 near the "Cope's Nipple" site in Garden Park, Colorado, near the very top of the late Jurassic Morrison Formation. In 1878, Cope named the specimen Hypsirhophus discurus. Some later researchers have considered Hypsirhophus to be a synonym of Stegosaurus, or a nomen dubium, though Kenneth Carpenter and Peter Galton have suggested that it is distinct and valid based on differences in the vertebrae.
- Carpenter, K (1998). "Vertebrate biostratigraphy of the Morrison Formation near Canon City, Colorado". Modern Geology. 23: 407–426.
- Gilmore CW (1914). "Osteology of the armored Dinosauria in the United States National Museum, with special reference to the genus Stegosaurus". Series: Smithsonian Institution. United States National Museum. Bulletin 89. Government Printing Office, Washington (89).
- Maidment, S. C. R.; Brassey, Charlotte; Barrett, Paul Michael (2015). "The Postcranial Skeleton of an Exceptionally Complete Individual of the Plated Dinosaur Stegosaurus stenops (Dinosauria: Thyreophora) from the Upper Jurassic Morrison Formation of Wyoming, U.S.A." PLoS ONE. 10 (10): e0138352. doi:10.1371/journal.pone.0138352. PMC 4605687. PMID 26466098.
- Galton, P.M. (2010). "Species of plated dinosaur Stegosaurus (Morrison Formation, Late Jurassic) of western USA: new type species designation needed". Swiss Journal of Geosciences. 103 (2): 187–198. doi:10.1007/s00015-010-0022-4.