Alternative spelling: Ornithosuchia
Synonyms: Omosauria Seeley 1887, Orthopoda Cope 1866
Full reference: H. G. Seeley. 1888. On the classification of the fossil animals commonly named Dinosauria. Proceedings of the Royal Society of London 43:165-171
Parent taxon: Eudinosauria according to M. T. Carrano 2025
See also Agnolín et al. 2023, Apesteguía et al. 2012, Arbour et al. 2014, Arbour and Evans 2017, Arbour and Evans 2019, Arldt 1909, Bakker and Galton 1974, Baur 1887, Benton 1979, Benton 1990, Brinkman and Sues 1987, Brown et al. 2017, Buffetaut and Ingavat 1992, Carroll 1988, Charig 1967, Cooper 1985, Cope 1866, Cope 1869, Cope 1870, Cope 1871, Cope 1875, Cope 1877, Cope 1883, Cope 1889, Cope 1891, Cope 1898, Coria et al. 2012, Cruzado-Caballero et al. 2010, Ellenberger 1972, Escaso et al. 2014, Estes 1964, Evans et al. 2013, Ezcurra 2006, Fowler and Freedman Fowler 2020, Freedman Fowler and Horner 2015, Gadow 1897, Gadow 1898, Gadow 1901, Gardiner 1982, Gasulla et al. 2015, Gauthier 1986, Gauthier et al. 1989, Gauthier and Padian 1985, Haubold 1971, Haubold 1974, Haughton and Brink 1954, Hay 1902, Hay 1930, Huene 1902, Huene 1909, Huene 1914, Huene 1927, Huene 1929, Huene 1948, Huene 1954, Ibiricu et al. 2019, Ibiricu et al. 2021, Jaekel 1910, Jaekel 1911, Jasinski and Sullivan 2011, Joleaud 1922, Kobayashi et al. 2019, Kuhn 1946, Kuhn 1964, Kuhn 1966, Lambe 1905, Langer and Benton 2006, Leahey et al. 2015, Long and Murry 1995, Lull 1904, Lull 1915, Lull 1917, Lull 1924, Madsen and Miller 1979, Madzia et al. 2018, Martinelli and Forasiepi 2004, Martínez and Alcober 2009, Martz and Small 2019, Matthew 1915, Matthew and Brown 1922, Moyano-Paz et al. 2022, Murray et al. 2019, Napoli et al. 2019, Nesbitt 2011, Nopcsa 1901, Nopcsa 1923, Nopcsa 1928, Novas 1989, Novas 1992, Novas 1993, Novas 1996, Novas et al. 2019, Osborn 1903, Osborn 1904, Ostrom 1980, Parks 1935, Parsch 1963, Peng et al. 2001, Penkalski and Tumanova 2017, Perrier 1928, Prieto-Márquez et al. 2019, Rivera-Sylva et al. 2017, Romer 1956, Romer 1966, Roxo 1937, Rozadilla et al. 2021, Ryan et al. 2023, Seeley 1879, Seeley 1887, Seeley 1888, Seeley 1888, Seeley 1888, Sereno 1986, Sereno 1997, Sereno 1998, Sereno 1999, Sereno et al. 1993, Shibata et al. 2011, Shibata et al. 2015, Sternberg 1954, Swinton 1934, Tanaka et al. 2024, Tatarinov 1964, Thulborn 1975, Thurmond and Jones 1981, Tornier 1913, Van Den Broeck 1900, von Zittel 1911, Wang et al. 2017, Watabe et al. 2011, Wilson et al. 2020, Winkler 1893, Yang et al. 2013, Young 1935, Zafaty et al. 2024, Zhao 1983, Zheng et al. 2012, Zheng et al. 2018, Zheng et al. 2009 and Zittel 1890
Sister taxa: Ancistrodon, Astrodon pusillus, Carnosauriformes, Dictyoolithidae, Diplodocia, Dongyangoolithidae, Dystrophaeidae, Fusioolithidae, Gigantosauropus, Harpagosauria, Herreravia, Huanglongpus, Iguanodonichnus, Lagunculapes, Megalosauridae, Mirsosauropus, Mosaicoolithus, Neosauropus, Nyasasaurus, Omosaurus phillipsi, Ornithischiformes, Paleodinosauria, Phaceloolithidae, Phytodinosauria, Phytophagi, Polyclonoolithidae, Postpubici, Praepubici, Prismatoolithidae, Saurischia, Sauropodichnus, Similifaveoloolithidae, Sinoichnites, Stalicoolithidae, Therophagi, Theropoda, Therosauria, Toyamasauripus, Tretospondylia, Xiphopeza, Youngoolithidae, Yunnanpus
Subtaxa: Alocodon Amtosaurus Apulosauripus Armatosauria Cairanoolithidae Chilesaurus Delatorrichnopodidae Delatorrichnus Enoplosauria Fabrosauridae Fabrosaurus Ferganocephale Genasauria Gregaripus Gyrotrisauropus Heterodontosauridae Heterodontosauriformes Komlosaurus Krzyzanowskisaurus Laquintasaura Lesothosauria Lesothosaurus Ligabueichnium Minisauripus Neornithischia Pisanosaurus Poposauria Predentata Stegosauroidae Tacuarembovum Trimucrodon
Ecology: ground dwelling herbivore