ANTH 1 Study Guide - Final Guide: Zygomatic Arch, Sagittal Crest, Lake Turkana
Document Summary
Robust postorbital restriction (mod. prognathism) sagittal crest low lying braincase very large projecting brow ridges projecting face flared cheekbones (zygomatic arch) large jaw, big molars heavy, gritty vegetation diet (herbivores) heavy facial muscles specialized diet - cannot adapt quickly. Species: robustus (2. 5 mya, boisei(2. 5-1. 4 mya, aethiopicus (2. 5 mya) Teeth wear on tip of canine, modified hoing. Gracile characteristics: pronounced prognathism no sagittal crest low lying brain case less sexual dimorphism not as flared cheeks (mod. zygomatic arch) smaller cheek teeth not as large teeth fruit based diet lacked heavy vegetation frugivores generalized diet adapts quickly. Species: afarensis (3. 5 mya - lucy, africanus(3. 0 mya, sediba(2. 5 mya, anamensis (4. 0 mya) As a group: small brains, small canines, large premolars, large molars. Australopithecus anamensis (4 mya ) lake" - kenya *earliest austral from east africa. Apelike characteristics: large canines, parallel tooth rows in upper jaw, lower third permolar w large outer cusp/ inner cusp (u shaped mouth)
