Figure 1

Humerus (anterior view) and cross sections of each taxon mapped on phylogeny. Scale bar equals 10 mm for humeri, for cross sections 1 mm. A cross indicates an extinct taxon. The letters refer to the lifestyles, volant (v), terrestrial (t) aquatic (a), and fossorial (f). The cross section of the humerus of Galemys was taken from the literature (Laurin et al., 2011).