final Flashcards
(49 cards)
a brief history of Australopithecus
southern ape, two well-known species: A.ramidus and Au. africanas
Australopithecus shared features
pelvis bipedal, not exactly like ours, feet look like ours but tiny
Australopithecus afarensis
Dates: 3.8-3.9 Ma and 380-550cc Location: ? Traits: megadont, suspensory arms, short femur w/valgus angle, small, human-like foot
Australipithecus afarensus bipedal how?
bent knee, bent hip, striding
Australopithecus africanas
Date: 3.3-2.1 Ma, Location: South Africa, Traits: similar to A. afarensis in primitive traits (arms) but exhibits more advanced morphology, large brain, more human-like pelvis
Paranthropus shared features
3 species, hypermegadont, small incisors, canines, dished face, sagittal crest
Difference between gracile (Australopithecus) and robust (Paranthropus) “Australopithecines
post- cranially very similar, cranially very different
Paranthropus aethiopicus
2.7-2.3 Ma, Ethipoia and Kenya, Huge sagital crest, and very prognathic
Paranthropus boisei
2.5-1.4 Ma, East Africa Ethiopia to Malawi, flexed cranium, anterior crest, 500-540cc
Paranthropus robustus
1.8-1.0 Ma, South Africa, very similar to P. boisei less robust
Australopith, Chronology and Biogeography
Adaptive radiation
rapid diversification in a lineage
Modified Savannah Hypothesis
origin of hypermtadont and expansion of tool use
How do we reconstruct diet?
teeth- 60-70% is denition, mastication system, wear patterns, isotopes
Dental anatomy and morphology (teeth)
Mastication system (levers)
Wear Patterns (enamel mircorwear)
Isotopes (C3 versus C4 vegetation)
Difference between Australopithecus and Paranthropus diets
Australopithecus: Megadont, strong mastication, more scratches (folivore), 30% C4, Paranthropus: Hypermegadont, powerful mastication, more pits ( brittle diet), 30% C4, P. boisei= mainly C4
Fallback foods and adaptation
underground storage organs- Australopth diet
the earliest evidence of stone tools and cut marks
stone tools: Lomekwi, Kenya- 3.4 Ma, cut marks: Dikika, Ethiopia- 3.4 Ma
earliest specimen of homo
2.8 Ma
The Habilines (general characteristics)
610-750cc, reduced dentition, precision grip, small body size, australopith body proportion generally, similar to australopiths, obligate biped, some arboreality, large-brained, tool making
How much variation is there within a single species?