Fig. 11

Tail region of Proganochelys quenstedtii (SMF 09-F2). A, Preserved caudal vertebrae in left lateral view. The black arrow points at the hemal arch of the 4^th preserved caudal vertebra from anterior. B, Preserved tail in ventral view. C, Preserved caudal vertebrae and anterior osteoderms of the tail club in dorsal view. D, Tail club in left lateral view. E, F, Individual osteoderms consisting of four spikes each, in anterior and posterior views. The exact position of these elements anterior to the tail club (i.e., closer to the base of the tail) is ambiguous. G, Isolated tail spike in anterior and posterior view. Abbreviations: c, centrum; ha, hemal arch; na, neural arch; os, osteoderm; poz, postzygapophysis; prz, prezygapophysis; tp, transverse process