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Boyer diss 2009 1046..

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Figure 4.6. Surface reconstructions of the radius of Plesiadapis cookei (UM 87990)<br />

using CT data [CT image resolution = 0.18(x) x 0.18(y) x 0.20(z) mm] compared to the<br />

radius of P. tricuspidens (MNHN R 550). A, the diaphysis of the CT reconstruction of the<br />

left radius of UM 87990 was separated from the right distal epiphysis and inverted to<br />

represent the right diaphysis. These two segments were then repositioned as they are<br />

thought to have been in life. Note the similarity between the distal ends of the photograph<br />

of P. tricuspidens and the reconstructed radius of P. cookei. The distal articular surfaces<br />

face ulnarly and palmarly to a similar degree. B, detailed comparisons of the distal<br />

epiphyses of the radii of P. cookei and P. tricuspidens. The styloid process, Lister’s<br />

tubercle and a more ulnarly positioned tubercle allow confident identification of the P.<br />

cookei element as belonging to the right side.<br />

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