Fig. 7 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA

Fig. 7. Comparisons between the manual and pedal skeleton of sauropodomorph material from the Navajo Sandstone of northern Arizona and the Navahopus coyoteensis isp. nov. trackway from Coyote Buttes. The skeletal material was originally referred to as Ammosaurus (Galton 1971), but has recently been revised and reinterpreted as belonging to an indeterminate sauropodomorph (Yates 2004). A. The manus of the sauropodomorph from northern Arizona is tridactyl and consists of two short, forward−facing digits (II and III) and the large pollex claw of digit I directed inward. The pes is tetradactyl with digits III and IV of subequal length, followed by the shorter digits II and I; modified from Baird (1980). B. Manus and pes couple from N. coyoteensis. Note the close correspondence between the pedal skeleton and the tracks, here shown to the same scale.