Heterodontosauridae
Ornithischia Ornithopoda Heterodontosauridae [Herbivore]
Named by Romer (1966) to acknowledge shared characteristics between the small ornithopods Heterodontosaurus (Crompton & Charig, 1962) and Lycorhynus (Haughton, 1924). Small (1-2 ml) bidepal herbivorous ornithischians. According to Weishampel and Witmer (1990), the Heterodontosauridae can be diagnosed on the basis of high-crowned cheek teeth with chisel-shaped crowns, denticles on the uppermost third of the crown, and the presence of large, canine-like teeth in both the premaxilla and the dentary. The cheeck teeth denticles are restricted to the apical third of the tooth crowns. This ans the presence of the large, caniniform teeth characterize the Heterodontosauridae as a monophyletic group.
Triassic Late
Lesotho
Abrictosaurus
Abrictosaurus consors - Upper Eliot Formation
Lycorhinus consors - Upper Eliot Formation
South Africa
Abrictosaurus
Abrictosaurus consors - Upper Eliot Formation
Lycorhinus consors - Upper Eliot Formation
Jurassic Early
Lesotho
Abrictosaurus
Abrictosaurus consors - Upper Eliot Formation
Lycorhinus consors - Upper Eliot Formation
Orange Free State
Lycorhinus angustidens - Upper Elliot Formation
Lanasaurus scalpridens - Upper Elliot Formation
South Africa
Abrictosaurus
Abrictosaurus consors - Upper Eliot Formation
Lycorhinus consors - Upper Eliot Formation
Geranosaurus atavus - Clarence Formation
Heterodontosaurus tucki - Upper Elliot Formation, Clarence Formation
Lycorhinus angustidens - Upper Elliot Formation
Lanasaurus scalpridens - Upper Elliot Formation
Pegomastax africana - Upper Elliot Formation
Jurassic Middle
Manidens condorensis - Canodon Asfalto Formation
Jurassic Late
England
Echinodon becklessi - Middle Purbeck Beds
Sauraechmodon - Middle Purbeck Beds
Sauraechinodon
US
Fruitadens haagarorum - Morrison Formation, Colorado
Cretaceous Early
China
Tianyulong confuciusi - Jehol Group Liaoning Province