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Lecture 7

01:460:206 Lecture Notes - Lecture 7: Ornithopod, Herrerasauridae, Thyreophora


Department
Geological Sciences
Course Code
01:460:206
Professor
L.Adamo
Lecture
7

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Chapter 9 Classification of Dinosaurs
Archosaurs
Dinosaurs give rise to birds
Triassic Takeover
o Diapsids dominant
Dinosaurs
o Oldest 228 MA late Triassic (South America Argentina)
o First Appearance 228 Ma
o Last Appearance 65 Ma
o Small bipedal carnivores (theropods)
All dinosaurs have fully erect posture separates from other reptiles
Two main types of dinosaurs (know types of hips)
o Saurischians (lizard hip) pelvis (acetabulum; other three come out)
Sauropomorpha
Theropoda
Birds evolved from them
o Ornithiscians (bird hip) different arrangement pubis
Ornithopoda
Thyreophora
Marginocephalia
o Five Faunas
o Parts of Hip
Ilium
Ischium
Pubis
Join at Acetabulum
Herrerasauridae
o Oldest dinosaurs
o Very primitive
o Close relatives to theropods
o Small to medium carnivores
o Lizard hip
o Five fingers
o Claws, short forearms, fast runners
Theropods
o Only carnivores
o Small arms
o Strong jaws and large skulls
o Bird type foot
Walk on digits 2-3-4
o Hollow bones
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