Full reference: E. Hitchcock. 1848. An attempt to discriminate and describe the animals that made the fossil footmarks of the United States, and especially of New England. Memoirs of the American Academy of Arts and Sciences, new series 3:129-256
Parent taxon: Dinosauria according to R. S. Lull 1904
Sister taxa: Actiosaurus, Carnosauriformes, Cridotrisauropus, Dictyoolithidae, Dystrophaeidae, Geosauridae, Gyrotrisauropus, Harpagosauria, Harpedactylus, Herreravia, Lagunculapes, Nyasasaurus, Ornithischia, Ornithischiformes, Ornithoscelida, Paleodinosauria, Phytodinosauria, Polemarchus, Prismatoolithidae, Rachitrema, Ravatosauropus, Saltosauropus, Saurischia, Sillimanius, Spondylosoma, Steropoides, Symphypoda, Tarsodactylus, Tarsoplectrus, Therosauria, Toyamasauripus, Tretospondylia, Youngoolithidae
Subtaxa: Xiphopeza triplex
Ecology: