GLY-1102 Lecture Notes - Lecture 24: Air Sacs, Tarbosaurus, Spinosaurus

• School: FSU
• Department: Earth, Ocean, and Atmospheric Science
• Course: GLY-1102
• Professor: Seth Young

Document Summary

Ceratosaurs: most primitive of the therapods, fused sacrum and ilium, fused bones in hind limb, most have tooth gap maxillary/premaxillary. Includes ceratosaurus (late jurassic, found in the morrison formation) Dilophosaurus: early jurassic, skull crests, for sexual display or for interspecies recognition, possible sexual dimorphism, tooth gap present, upper pallet separated into two bone parts, bite tentative, possibly more of a scavenger than a predator. Largest of the therapods, all > 5 m long. Large heads: short necks, very short arms, massive legs, appeared mid jurassic, most common in late jurassic - cretaceous, dinstinguishing features: Long tails: additional antorbital fenestra, foramen in lachrytmal bone (skull, short spines on thoracic vertebra, up turned end of the femur. Includes: t-rex, oviraptors, ornithomimids, dromaeosaurs (popularly known as the raptor, troodontids, birds, characteristics, enlarged brain, narrow three fingered hand, tail stiffening chevrons, long slender foot (compressed metatarsals, proto (cid:862)feathers(cid:863)