Dear student, 1 pectoral girdle is a skeletal support from where the forelimbs of vertebrates are attached whereas pelvic girdle is a skeletal support form where the hind limbs of vertebrates are attached. 2.Pectoral girdle is composed of two Bones namely, clavicle or collar bones and scapula or shoulder bone whereas pelvic girdle is composed of three bones, upper ileum, inner pubic, and ischium. Thanks and regards