121australopithecus

121australopithecus - Australopithecus garhi Recently...

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Australopithecus garhi Recently discovered 2.5 m.y.a. hominid as a site in Ethiopia Associated with crushed bones In the right place and dates from the right time to have given rise to later humans The skull of A. garhi looks very different from A. africanus, surprisingly primitive with a protruding apelike face. Looks like a scaled-up afarensis except its brain stayed small with a capacity of about 270cc
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A. garhi phylogenetic relationships
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The Taung Baby The first Australopithecine discovery Described by Raymond Dart as a hominid based on dental and cranial features Given the name: Australopithecus africanus Not accepted at first because of Piltdown Raymond Dart
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Australopithecus africanus Initially described by Robert Broom as a new genus, Pleisanthropus Remains of this comparatively lightly built or "gracile" species of australopithecine have been recovered from sites in South Africa (Sterkfontein, Makapansgat and Taung) Its presence in East Africa is subject of dispute Robert Broom
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Australopithecus africanus dental features No sectorial canine function, canines only wear on the tip not on the back edge as in A. afarensis No gap (diastema) between canines and premolars Lacks a sectorial lower premolars. premolars are similar in shape and used for grinding Molars are bigger than in A. afarensis A. afarensis A. africanus
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Cranial Features of Australopithecus africanus • Brain case is small and rounded • Considerable facial prognathism with a "dished out" facial profile
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Australopithecus africanus • Average cranial capacity around 450 to 500 cc • Foramen magnum is located under vault for bipedalism • Studies of internal casts of the braincase indicate an expansion of areas associated with higher cognitive functions. Whether or not
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121australopithecus - Australopithecus garhi Recently...

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