Fig. 1

Stegosaurus armatus Marsh1877, part of holotype YPM 1850, from the Morrison Formation (Kimmeridgian–Tithonian) of Wyoming, USA. Vertebrae from proximal half of tail (order passing distally: a, d, e, g, b, f), dorsal vertebrae (c, h), and a large dermal plate (i). a First or second caudal vertebra. b Caudals with neural spines and centra, some with chevrons, in right lateral view, * indicates where these two blocks fit together (M.T. Mossbrucker, pers. comm. 2009). c Partially prepared dorsal centrum in lateral view. d, e Caudal in left lateral (d) and anterior (e) views. f Caudal centra in left lateral view. g Four almost complete caudals in right lateral view. h Partial neural spine and transverse process of a dorsal vertebra in anterior or posterior view. i Fragments of a large dermal plate, probably from above the pelvic region or at base of tail. Modified from Carpenter and Galton (2001). Scale bars 10 cm