An early Australopithecus afarensis postcranium from Woranso-Mille, Ethiopia.
Only one partial skeleton that includes both forelimb and hindlimb elements has been reported for Australopithecus afarensis. The diminutive size of this specimen (A.L. 288-1 ["Lucy"]) has hampered our understanding of the paleobiology of this species absent the potential impact of allometry. Here we describe a large-bodied (i.e., well within the range of living Homo) specimen that, at 3.58 Ma, also substantially antedates A.L. 288-1. It provides fundamental evidence of limb proportions, thoracic form, and locomotor heritage in Australopithecus afarensis. Together, these characteristics further establish that bipedality in Australopithecus was highly evolved and that thoracic form differed substantially from that of either extant African ape.
Haile-Selassie
Yohannes
Y
The Cleveland Museum of Natural History, Cleveland, OH 44106, USA. yhailese@cmnh.org
Latimer
Bruce M
BM
Alene
Mulugeta
M
Deino
Alan L
AL
Gibert
Luis
L
Melillo
Stephanie M
SM
Saylor
Beverly Z
BZ
Scott
Gary R
GR
Lovejoy
C Owen
CO
D000077:Acetabulum / Q000033:anatomy & histology; D000818:Animals; D005075:Biological Evolution; D005002:Ethiopia; D005270:Femur Head / Q000033:anatomy & histology; D005580:Fossils; D005844:Geology; D015186:Hominidae / Q000033:anatomy & histology*; D008124:Locomotion; D010163:Paleontology / Q000379:methods; D012886:Skull / Q000033:anatomy & histology*; D013977:Tibia / Q000033:anatomy & histology; D013997:Time Factors