Further morphometric studies of the ulna from the Omo Basin, Ethiopia

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Abstract
A reanalysis of the L40–19 fossil ulna from the Omo Basin, Ethiopia is presented. Using covariance adjustment rather than ratios to correct metric data for variations due to body size, a comparative sample reflecting 21 contemporary Anthropoid taxa, and both distribution‐free and multivari‐ate statistical procedures, this study indicates that the earlier conclusion drawn by McHenry et al. (76), viz., that the fossil is “unique” among Hominoids, is essentially correct. This study also concludes, however, that although the fossil is projected closer to Pan and Homo than to Pongo, the distances are considerably greater than found between behaviorally similar modern forms. Consequently, aside from assigning the fossil on morphometric grounds to the Hominoidea, little else can be said about its possible locomotor habits or its ancestry.

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