BIOLOGY 1M03 Study Guide - Final Guide: Sahelanthropus, Foramen Magnum, Homininae
12 Apr 2016
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Document Summary
Six million years ago, climate & geographic change led to the evolution of hominins: cooling, less rain, rain seasonality, woodland & savanna spread, superfamily hominoidae = gibbons , family hominindae = orangutans , subfamily. Homininae = gorillas, chimps, humas: tribe. We have small canines & large molars with thick enamel. We have very slow life histories & a long juvenile period. We talk & have elaborate symbolic culture. Wednesday, november 11, 2015: short & stout (ilium) in a biped, abductor mechanismution. Femur: long femoral neck, cortical bone distribution. Foot & ankle: non grasping big toes, arches. Feeding adaptation: arboreal bipedalism, ground feeding. Between 7 to 5 mya, the common ancestor for chimps & humans roamed the earth. Sahelanthropus tchadensis (sahel = vast dry region in south sahara desert, chad = Country), discovered in 2002, is the earliest known hominin, living around 7 to 6 mya. It is characterized by derived & ancestral traits.
