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Fig. 3. (A) Articular movement of the right pteroid as reconstructed by Wilkinson
et al. (Wilkinson et al.,
2006). From the forward-pointing orientation, flexion at first
takes the form of pure depression, so that the pteroid is confined to the
indicated vertical plane that lies perpendicular to the wing spar. Depression
then gives way to adduction, and the pteroid swings towards the body,
eventually coming to occupy a plane parallel to the wing spar at the limit of
flexion (broken outline). (B) Dorsal (top) and anterior (bottom) views of a
virtual model of Anhanguera, with an extended propatagium (indicated
in dark blue) and forward-pointing pteroid (indicated in red). (C) As in B,
but with the pteroid fully flexed and the propatagium furled. Abbreviations as
in Fig. 1.
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