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Antrodemus ("chamber bodied") is a nomen dubium genus of Theropoda dinosaur from the Upper Jurassic, probably the Morrison Formation, of Middle Park, Colorado. It contains one species, Antrodemus valens, first described and named as a species of Poekilopleuron by Joseph Leidy in 1870.
In 1920, Charles W. Gilmore concluded that the tail vertebra named Antrodemus by Leidy was indistinguishable from those of Allosaurus and that Antrodemus should be the preferred name because, as the older name, it had priority. Antrodemus became the accepted name for this familiar genus for over fifty years until James Madsen published on the Cleveland-Lloyd specimens of Allosaurus and concluded that the Allosaurus name should be used because Antrodemus was based on material with poor, if any, diagnostic features and locality information (for example, the geological formation that the single bone of Antrodemus came from is unknown). Subsequent authors have agreed with this assessment and have considered Antrodemus a nomen dubium.
The paleontological site that still in the present day presents the highest concentration of fossilised individuals of Allosaurus fragilis is the Cleveland-Lloyd Dinosaur Quarry, now part of the Jurassic National Monument in Utah. The first skeletal mount obtained out of the Quarry was extracted in the late 1930s/early 1940s and finally mounted in 1961 in Guyot Hall, Princeton University, Princeton, New Jersey, where it remained on display until 2024. For years, that skeletal mount was presented to the visitors under the taxonomic name Antrodemus, before the specimens from the Cleveland-Lloyd Quarry were attributed to Allosaurus.
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