Synonyms: Segnosauria Barsbold and Perle 1980, Segnosaurischia Dong 1992
Full reference: D. A. Russell and Z.-M. Dong. 1994. The affinities of a new theropod from the Alxa Desert, Inner Mongolia, People's Republic of China. Canadian Journal of Earth Sciences 30(10-11):2107-2127
Parent taxon: Coelurosauria according to J. M. Clark et al. 2004
Sister taxa: Alvarezsauria, Aniksosaurus, Aorun, Bicentenaria, Bressanichnus, Britoichnium, Coelurus, Columbosauripus, Compsognathidae, Compsognathus, Defarrariischnium, Halticosauridae, Ignotornis, Juravenator, Lapparentichnus, Lourinhanosaurus, Maniraptora, Maniraptoriformes, Nedcolbertia, Ngexisaurus, Ornitholestes, Ornithomimipus, Plesiothornipus, Proceratosaurus, Richardoestesia, Satapliasaurus, Segisauridae, Shensipus, Sinosauropteryx, Tanycolagreus, Taupezia, Tugulusaurus, Tyrannosauroidea, Xinjiangovenator, Zuolong
Subtaxa: Alxasauridae, Beipiaosaurus, Dendroolithidae, Enigmosaurus, Falcarius, Martharaptor, Suzhousaurus, Therizinosauridae
Type: Therizinosaurus
Ecology: ground dwelling herbivore