Holotype specimen of <i>Hylaeosaurus armatus</i> Mantell, 1833 (NMH R3775) from the Grinstead Clay Formation (late Valanginian) of Tilgate Forest, Sussex, southern England.

<p>A, skeleton as preserved; B, purported elements of lateral row of osteoderms highlighted. Abbreviations: cls, cervical lateral spine; ?ds, supposed dorsal spine, considered a pectoral lateral spine by <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060571#pone.0060571-PeredaSuberbiola1" target="_blank">[11]</a> (see text); pls, pectoral lateral spine; tls, thoracal lateral spine. Scale-bar units equal 1 cm. Photo courtesy M. Triebold.