Antrodemus

Antrodemus; Temporal range: Late Jurassic, ;
	Holotype tail vertebra (above) compared to same of Allosaurus (below)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Family:	†Allosauridae
Genus:	†Antrodemus; Leidy, 1870
Species:	†A. valens
Binomial name
	†Antrodemus valens; (Leidy, 1870) Leidy, 1873
Synonyms
	Poekilopleuron valens Leidy, 1870; Megalosaurus valens (Leidy, 1870) Nopcsa, 1901; Allosaurus valens (Leidy, 1870) Huene, 1932;

Antrodemus ("chamber bodied") is a dubious genus of theropod 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.