Fig. 5From: Getting a head in hard soils: Convergent skull evolution and divergent allometric patterns explain shape variation in a highly diverse genus of pocket gophers (Thomomys)Humeral shape principal component analysis. For all humeral PCs, positive scores correspond with more derived tooth-digging shapes a–c. Anterior humeral PC1 shows increased deltoid process size a. PC2 shows increased medial epicondyle size b Back to article page