Earth Sciences 2266F/G Lecture Notes - Lecture 14: Saber-Toothed Cat, Zygomatic Arch, Occipital Condyle
6 Mar 2020
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Pulse 2 (early triassic): therapsids, high metabolic rate, improve posture. Pulse 3 (late triassic): cynodont therapsid, endothermy, secondary palate. Changes in body: shorten tail (upright posture), short phalanges feet symmetrical, lightening shoulder girdle. Most basal group: moderate size, lightly built carnivores, prominent teeth. Moschops shearing contact between upper/low (food slice thin) interlocking incisor front teeth face downturn, deep temportal region: erect hind limbs, spraw forelimb. Anomodontia: most successful and abundant, specialization of mouthparts teeth reduce to 2 tusks (beak) Largest carnivore of permian: saber teeth (heterodont shape) temporal fenestra, pillar legs. Therocephalia large skull and teeth suggest carnivores: enlarge temportal opening for broader jaw adductor reduction of phalanges. Turbinates in nasal: scrolled sheets of bone cover in tissue called conchae: warm incoming air, support specialized tissue that aid smell. Most advance therapsid large zygomatic arch, double occipital condyle large coronoid process accommondate by outward flare of zygo arch loss of lumber ribs.
