ANT 350 Study Guide - Quiz Guide: Iliopsoas, Australopithecine, Cradle Of Humankind
Document Summary
Post cranium was very hominin-like: os coxae and sacrum indicates a fundamental biped. Broad os coxae with a short iliac blade (shorter than apes but still longer than modern humans) Weak iliopsoas groove (in apes this is absent, so we see progression) Posterior facing iliac blade like apes, however the form of the pelvis is more like that of hominins. Sacrum has 5 vertebrae (apes have 6) Sacrum has 6 lumbar (apes have 5) Tibial plateau perpendicular to the shaft: pes are totally hominin, except that toes 2-5 are longer and slightly curved. Hallux in line with other toes (more non-divergent hallux) Used for walking rather than grasping: humeral/femoral index is much smaller than extant great apes and more human like (everything over 100 is brachiation, everything under is quadruped or biped) Laetoli footprints: hominin foot pattern matches hadar foot proportions, so most likely afarensis. Deep heel strike and toe-off hominin stride.
