Fig. 6From: Oldest ctenodactyloid tarsals from the Eocene of China and evolution of locomotor adaptations in early rodentsComparative morphology of the astragalus (right). Tamquammys robustus (a) IVPP V24136.4; (b) T. wilsoni, IVPP V24137.5 (mirror image); extant rodents: Rattus norvegicus (c), Cricetus cricetus (d), Glis glis (e), Marmota marmota (f), Sciurotamias davidianus (g), Ondatra zibethicus (h). Note a relatively deep trochlea and long erect neck, both indicators of improved orthal movementBack to article page