Full reference: F. D. Jackson and D. J. Varricchio. 2010. Fossil eggs and eggshell from the lowermost Two Medicine Formation of western Montana, Sevenmile Hill locality. Journal of Vertebrate Paleontology 30(4):1142-1156
Parent taxon: Theropoda according to F. D. Jackson and D. J. Varricchio 2010
Sister taxa: Ageroolithus, Anchisauripodidae, Archaeornithoididae, Asianopodus, Avipoda, Boutakioutichnium, Bueckeburgichnus, Byakudansauropus, Carmelopodus, Coeluridae, Coelurosauroidea, Compsognatha, Corpulentapus, Daemonosaurus, Deinocheirosauria, Elongatoolithidae, Eodromaeus, Eoraptor, Eubrontidae, Fenestrosaurus, Fuscinapedis, Gigandipodidae, Grallatoridae, Hadrosaurichnus, Herrerasauridae, Iranosauripus, Itsukisauropus, Jialingpus, Kalohipus, Kayentapus, Kuangyuanpus, Kuwajimasauropus, Laevisoolithidae, Megalosauropus, Minisauripus, Neotheropoda, Neotrisauropus, Ornithoides, Ovoraptor, Paleotheropoda, Parachirotheriidae, Paragrallator, Picunichnus, Plectropus, Protoavis, Reticuloolithus, Sarmientichnus, Saurexallopus, Sauropodidae, Selenichnidae, Selenichnus, Siamopodus, Sigilmassasauridae, Sinosaurus, Skartopus, Spinosauria, Subtiliolithidae, Tawa, Therangospodus, Tubercuoolithus, Unenlagiidae, Wildeichnus, Yangtzepus, Yaverlandia, Zanclodontidae, Szechuanosaurus yandonensis
Subtaxa: Triprismatoolithus stephensi
Type: Triprismatoolithus stephensi
Ecology: ground dwelling carnivore