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The astragalus is shown in proximal (A), medial (B), anterior (C), lateral (D), posterior (E), and distal (F) view. Note the autapomorphic, concave posteroventral edge, with a distinct bulge medial to it (1). Abb.: af, astragalar foramen; asp, ascending process; dro, distal roller; fif, fibular facet; tif, tibial facet. Scale bar = 5 cm.
