Editing Diprotodon (section)

====Girdles====
The general proportions of the [[scapula]] (shoulder blade) align more closely with more-basal vertebrates such as [[monotreme]]s, [[bird]]s, [[reptile]]s, and [[fish]] rather than marsupials and [[placental mammal]]s. It is triangular and proportionally narrow but unlike most mammals with a triangular scapula, the arm attaches to top of the scapula and the subspinous fossa (the [[fossa (anatomy)|fossa]], a depression below the [[spine of scapula|spine of the scapula]]) becomes bigger towards the arm joint rather than decreasing. The [[glenoid cavity]] where the arm connects is oval shaped as in most mammals.{{sfn|Owen|1870|loc=pp. 548–550}}

Unlike other marsupials, the [[ilium (bone)|ilia]], the large wings of the [[pelvis]], are lamelliform (short and broad, with a flat surface instead of an [[iliac fossa]]). Lamelliform ilia have only been recorded in [[elephant]]s, [[sloth]]s, and [[ape]]s, though these groups all have a much-longer sacral vertebra series whereas marsupials are restricted to two sacral vertebrae. The ilia provided strong muscle attachments that were probably oriented and used much the same as those in an elephant. The [[sacroiliac joint]] where the pelvis connects to the spine is at 35 degrees in reference to the long axis of the ilium. The [[ischium|ischia]], which form part of the [[hip socket]], are thick and rounded tailwards but taper and diverge towards the socket, unlike those in kangaroos, where the ischia proceed almost parallel to each other. They were not connected to the vertebra. The hip socket itself is well-rounded and almost hemispherical.{{sfn|Owen|1870|loc=pp. 554–560}}