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. 2013 Sep 18;8(9):e74842. doi: 10.1371/journal.pone.0074842

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© 2013 VanBuren, Bonnan

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The radial head (A) and long axis (B) of Caiman crocodylus (ROM R7719) shows the flattened ulnar articular surface and relatively straight long axis typical of sprawling taxa. The radial head (C) and long axis (D) of Ursus americanas (USNM 49664) shows the rounded ulnar articular surface and curved long axis typical of parasagittal mammals and chameleons. Scale bar = 5 cm. Radial heads not to scale. rh, radial head; sp, styloid process; us, ulnar articular surface.