Fig. 5.

(A) In sarcopterygian fish the pelvic girdle is supported by the hypaxial musculature and consists of a pubis (pb) with a caudally oriented acetabulum (ac) (articulation to the fin) (redrawn from Andrews & Westoll, 1970). (B) In early tetrapods the pelvic girdle consists of a pubis, an ischium (ish), and an ilium (il), which connects to the vertebral column through the sacral rib (sr). The acetabulum is placed laterally (redrawn from Coates, 1996). Figure modified from Cole et al. (2011).