JOURNAL ARTICLE

New hominin genus from eastern Africa shows diverse middle Pliocene lineages

M G Leakey, F Spoor, F H Brown, P N Gathogo, C Kiarie, L N Leakey, I McDougall
Nature 2001 March 22, 410 (6827): 433-40
11260704
Most interpretations of early hominin phylogeny recognize a single early to middle Pliocene ancestral lineage, best represented by Australopithecus afarensis, which gave rise to a radiation of taxa in the late Pliocene. Here we report on new fossils discovered west of Lake Turkana, Kenya, which differ markedly from those of contemporary A. afarensis, indicating that hominin taxonomic diversity extended back, well into the middle Pliocene. A 3.5 Myr-old cranium, showing a unique combination of derived facial and primitive neurocranial features, is assigned to a new genus of hominin. These findings point to an early diet-driven adaptive radiation, provide new insight on the association of hominin craniodental features, and have implications for our understanding of Plio-Pleistocene hominin phylogeny.

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