Figure 2.

(a–c) Ornithischian pectoral girdles and forelimbs and (d–f) pelvic girdles and hind limbs in left lateral view. (a,d) reconstructed generalized bipedal basal ornithischian, after [14]; (b,e) Stegosaurus armatus, quadrupedal, based on various specimens (see the electronic supplementary material, table S4); (c,f) Lambeosaurus lambei, quadrupedal, based on ROM (Royal Ontario Museum, Toronto, Canada) 1218. Labels in uppercase denote musculature: ADD 1 & 2, adductor 1 & 2; DCL, deltoideus clavicularis; DSC, deltoideus scapularis; IFE, iliofemoralis externus; ITC, iliotrochantericus caudalis; PEC, pectoralis; PIFE, puboischiofemoralis externus 1 & 2; PIFI 1 & 2 puboischiofemoralis internus 1 & 2; SCC, supracoracoideus; those in lowercase indicate osteology: acr, acromial process; at, anterior trochanter; dpc, deltopectoral crest; gt, greater trochanter; pap, preacetabular process; poap, postacetabular process; stf, supratrochanteric flange. Not to scale.