Anthropology5_Cast_of_Characters

Anthropology5_Cast_of_Characters - Anthro5 18:04...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Anthro 5 18:04 Cast of Characters 1. What was their ecology? 2. Were the same selection pressures operating over the entire 7 million year  period? 3. Might the various hominin species have been subject to different selection  pressures? We might usefully think about “adaptive grades” 1. Pre Australopithecus forms 2. Australopithecines: a. Australopithecus b. Paranthropus 3. Homo Sahelanthropus 6.0 mya to 7.0; Chad. Skull Deformed Flat face and hevy brow ridges, characterist of much later hominins. Bipedal?  Central foramen magnum. Nuchal region (back of skill) apelike. Small brain (320  to 350cc)  U-shaped dental arcade; apelike teeth.  Somewhat reduced canines.  Intermediate enamel thickness. Light forest near a lakeshore Orrorin tugenensis. 6.0 mya; Kenya Femur (thigh bone) suggests bipedality
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Thick molar enamel. Chimp-like incisors, canines, and premolars Arm and finger bones suggest climbing Associated fossils include forest-living savanna-dwelling forms.  Ardipthecus ramidus Ardipithecus kadabba Ethiopia. 5.8-4.4mya Bipedal? Anterior foramen magnum, extensive post-cranial remains Smaller canines than non-homin apes; lacks CP3 complex. Intermediate molar enamel Relatively small molars. Forest Environment Australopithecus spp. 4.2 to 1.0 mya: much of E. and S. Africa
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

Anthropology5_Cast_of_Characters - Anthro5 18:04...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online