Comparison of outline drawings of ankylosaur ulnae.

<p>A, <i>Chuanqilong chaoyangensis</i>, left ulna in medial view; B, <i>Liaoningosaurus paradoxus</i> (IVPP V12560), left ulna in medial view; C, <i>Peloroplites cedrimontanus</i> (CEUM 11347), right ulna in lateral view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-Carpenter7" target="_blank">[44]</a>; D, <i>Hungarosaurus tormai</i> (MTM 2007.25.2), right ulna in lateral view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-si1" target="_blank">[55]</a>; E, <i>Niobrosaurus coleii</i> (MU 650 VP), right ulna in lateral view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-Carpenter9" target="_blank">[65]</a>; F, <i>Minmi</i> sp. (QMF 18101), left ulna in medial view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-Molnar1" target="_blank">[24]</a>; G, <i>Cedarpelta bilbeyhallorum</i> (CEUM 10256), left ulna in medial view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-Carpenter7" target="_blank">[44]</a>; H, <i>Euoplocephalus tutus</i> (AMNH 5406), right ulna in medial view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-Arbour1" target="_blank">[31]</a>; I, <i>Pinacosaurus</i> (MPC 100/1323), left ulna in lateral view, from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104551#pone.0104551-Currie1" target="_blank">[46]</a>. Scale bars in A, C–H equal10 cm; scale bar in B equals 1 cm; scale bar in I equals 5 cm. [planned for page width].</p>