ATH 351-01

*** VIDEO: In search of human origins (Nova)  ***

Lucy/Johansen

Hadar Ethiopia, Awash river

A. Afarensis

  • context
    • Ethiopia (Hadar), Tanzania (Laetoli)
    • 4-3mya
  • Discoverer
    • Don Johanson (1973)
  • Derived traits
    • valgus knee
    • short broad pelvis
    • convergen t hallux
    • footprints: heel depression, arch
    • centrally located FM

HALF OF NOTES LOST — THANKS, CATS!  :(

First family:

knee joint

  • valgus knee hips wider which means that the femur connected to tibia at angle
  • laetloi, curved finger bones
  • short thumbs

Lucy pelvis diagram, compared to human

primitive traits

  • small brain 400cc
  • prognatic
  • sexual dimorphism
  • nuchal crest pronounced. long & low
  • funnel ribcage

skulls first based on fragments, full skull found in 1994 to confirm reconstruction

no saggital crest in Lucy species

Dentition: Intermediate traits

  • parallel tooth rows
  • flat palate
  • relatively large canines
  • semi-sectorial premolar
  • small canine diastema
  • no honing complex
  • relatively large molars

A. Afarensis Mandible

  • ramus morphology
    • coronoid process
    • condylar process
    • mandibular notch
  • similar to gorilla, paranthropus
    • coronoid > condylar
    • unlike chimp, human
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