EARTH 7 Lecture Notes - Lecture 11: Ceratopsidae, Heterodontosaurus, Saurischia
Document Summary
Cerapods (continued) and intro to saurischia and sauropodomorphs. Joint in upper skull that allows the upper jaw to move laterally. Jurassic through end-cretaceous: widespread and very diverse (100+ known species) Heterodontosaurus: early jurassic, south africa, reached about 1 m in length. Many teeth fused into a larger structure. Co(cid:374)(cid:448)erge(cid:374)t (cid:449)ith group that i(cid:374)(cid:272)ludes (cid:272)eratopsids + (cid:862)proto(cid:272)eratopsids(cid:863) Creates a large grinding surface for chewing: extremely enlarged nasal passages. Juveniles often found surrounded by broken egg shells. At nesting sites, lots of embryos, babies, and juveniles discovered. Baby fossils suggest that legs were not developed enough to walk. Evidence of rotting vegetation used to incubate nest. Juvenile teeth appear worn out even before they left the nests (parents may have brought them food. All suggests that there was complex colony nesting, and that parents cared for eggs, babies, and young juveniles: maiasaura (cid:862)(cid:272)ari(cid:374)g (cid:373)other lizard(cid:863) Not maiasaurus because the genus is named after the female gender.
