GLY-1842 Lecture Notes - Lecture 11: Stegosauria, Huayangosaurus, Lesothosaurus
Document Summary
Ornithopods stegosaurs, hadrosaurs & iguanodontids ankylosaurs cerotopians pachycephalosaurus. H2 ornith body plans > saur non pelvic synamorphies. Lesothosaurus: basal ornithiscian, fabrosaurid, early jurassic, africa? ( he change the slide) Thyreophora are the first group of successful and lasting ornithischians: armor is comprised of osteoderms. Scutellosauris: first armored dinosaur, early jurassic, arizona. Scelidosaurus: primitive thyreophran, lower jurassic of gbr, usa, china. Stegosaurs: middle jurassic, early cretaceous early jurassic footprints principally jurassic story, abundant in late jurassic, pangean distribution. Huayangosaurus: most primitive known stegosaur, middle jurassic china. Ankylosaurian: polacathidae most primitive lighter armor may be a grade, ankylosauridae tail clubs triangular skulls complex nasal passages anterior nares, nodosauridae no tail clubs, more spikes rounded skulls simple lateral nares. Thyreophorans: diverse yet never very abundant, generally increase armor j to k, stegosaurs big in j, ankylosaur in k, long lasting especially ankylosaurs, tanks of mesozoic. Feeding adaptations: ventrally offset premaxilla, long premaxillary process, depressed jaw joint.
