ARCH 131 Final: Unit 6.2 The Earliest Hominin
22 Apr 2018
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Document Summary
Males probably larger than females but not much. Prehensile feet-tell us they"re not obligate bipeds but walk when on the ground: some advance features: Increased bipedalism when on ground: some believe they"re in pan lineage (chimp ancestors) (probably not) but some believe they"re in homo lineage (our ancestors) (most likely) But fingers a little longer but not as much as the previous ones. These guys have lost the ability to be knuckle lockers-the wrist bones are incapable of being locked-so they"re pretty much like ours: obligate bipedalism evidence. The neck" of the femur is twice as long. Chimps have legs going straight down, we and afarensis don"t-so our foot lands under center of gravity. It seems like small changes but makes big dif. -small angle at origin leads to angle of legs-straight or bent towards inside(us) Their bipedalism evidence also comes from their footprints. X-ray picture shows pressure when walking and weight transfer which implies walking style.
