ANTA01H3 Lecture Notes - Foramen Magnum, Sagittal Crest, Diastema
Document Summary
Apelike cranial traits in early hominins: prognathic face, cheek bones, reduced, small cranium (300-500 cc) Emergence of homo (2. 5-1. 8 mya: generally less prognathic, smaller incisors, canines, larger premolars & molars. Specialised diet poor quality: muscle attachment for chewing muscles on top and/or rear of cranium. Large temporal fossa: broad, high face, forehead flatter, long arms; curved fingers & toes; divergent toe, arboreal & bipedal, robustus, boisei, expanded brain (avg. 1. rudolfensis has a fairly large brain case; habilis has a small brain case. 2. rudolfensis has a broad flat face; habilis" face is small and not very flat (more prognathic) 3. rudolfensis has less defined brow ridge; habilis has a very defined supraorbital torus. 5. the occipital bone at the rear of the skull is wider at the base in rudolfensis. 6. somewhat lower post-orbital constriction in rudolfensis; cranium also appears to be wider at the parietal bones (greater brain development)
