ERTH 2104 Lecture Notes - Lecture 5: Skull, Avemetatarsalia, Turtle
14 Dec 2019
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Document Summary
Braincase (visible through lower temporal fenestra temporal opening) Jaw muscles pass through to attach upper part of skull. Were most dominant terrestrial vertebrates during early mesozoic. Braincase (visible through upper and lower temporal opening) Possibility creating space for jaw muscles and their attachment. Recent discoveries of earliest ancestors show and upper fenestrae placing turtles into. Two clades of diasid reptiles: leidosauroporha; snakes, lizards, archosauromorpha; crocodiles, birds, dinos. Others with legs adapted to running on land. Plane of legs perpendicular to plane of torso. Scapulae : the shoulder blades on both sides of backbone. Sternum (breastbone): at the chest within the thoracic ribs (in dinosaurs made out of cartilage) Femur : upper bone (very big bones in dinosaurs) Elbows and knees bend in opposite direction. Phalanges : bones allowing flexibility of hands and feet. Two groups of dinosaurs: proposed by h. g seely. Ornithischia (ornith = bird, ischia = hip)
