Figure 23. A in Scelidosaurus harrisonii (Dinosauria: Ornithischia) from the Early Jurassic of Dorset, England: biology and phylogenetic relationships

Figure 23. A theoretical model of pelvic aspiration in ornithopod ornithischians (based on a hadrosaur pelvis). A, B, dorsal views of the pelvic region showing the transverse motion suggested for the pubes that serially compressed and decompressed the abdominal cavity. Note: the ischia should meet distally on the midline, rather than remaining separate as shown here. C, lateral view of the pelvis showing a reconstruction of a hypothetical pubic abductor muscle. After Carrier & Farmer (2000a: fig. 10B). Abbreviations: Exp, expiration (pubes adducted); Insp, inspiration (pubes abducted); il, ilium; ipm, (hypothetical) iliopubic muscle; is, ischium; pu, pubis.