ANTHR-140 Lecture Notes - Lecture 9: Postorbital Bar, Postorbital Bone, Zygomatic Arch
22 Dec 2020
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Class notes primate origins and the earliest hominins. Review how to recognize bipedalism in the fossil record (especially chimp vs. human anatomy) Evaluate the candidates for the earliest definitive hominin in the fossil record. Hominoid all apes, member of superfamily hominoidea. Hominid modern and extinct great apes (family hominidae, which includes modern humans, chimps, gorillas, orangs and immediate ancestors) (gibbons are forbidden) Hominin modern humans and their closest relatives bipedalism. Ardipithecus is the earliest widely accepted hominin genus. Postorbital bar - the postorbital bar (or postorbital bone) is a bony arched structure that connects the frontal bone of the skull to the zygomatic arch, which runs laterally around the eye socket . large brain. Short snout - the projecting nose and mouth of an animal, Divergent big toe for grasping (abducted hallux) why did we diverge from other mammals: arboreal hypothesis. Adaptive shift for from terrestrial to arboreal habitat: angiosperm radiation hypothesis.
