ANTHR 101 Lecture Notes - Lecture 31: Orrorin, Sahelanthropus, Foramen Magnum
Document Summary
Dental arcade: apes are more u shaped, humans are parabolic (more rounded, facial prognathism/orthognathism (face shape) Prognathism: the face is more outward and forward. Cp3 or sectorial premolar complex: diastema: means space, reduction: teeth and canines reduce, dental arcade (shape of teeth) changes due to the size of the teeth. Enamel thickness: apes- thin enamel on teeth, humans- thick enamel on teeth. Earliest hominins: pre-australopiths (6+ - 4. 4 mya, australopiths (4. 2 - 1. 2 mya, early homo (2+ - 1. 4 mya) Bipedal: found a femur, top looks more rounded and ball like, suggests it walked on two feet. Not considered a missing link, believed to be first one after the spit. Ardipithecus ramidus: 4. 4 ma in ethiopia, complete but fragmented skeleton, suggested to be bipedal and has a diverging big toe, chimp-like teeth characteristics, lived in woody environment, australopithecines. Features: found in pliocene (4. 3-1. 1 ma, small bipeds, large jaws and teeth, scavengers and gatherers, gracile and robust australopithecine, australopithecus anamensis.
