FIG. 72 in Model-based analysis of postcranial osteology of marsupials from the Palaeocene of Itaboraí (Brazil) and the phylogenetics and biogeography of Metatheria

FIG. 72. — Comparison of left astragali and their articular patterns in selected metatherians to illustrate what were probably linear stages of transformation in the upper and lower ankle joints, as well as the astragalonavicular joint; A-C, a sudameridelphian (IMG I); A, dorsal view; B, plantar view; C, distal view; D-F, a didelphid (Marmosa); D, dorsal view; E, plantar view; F, distal view; G-I, a microbiothere (Dromiciops); G, dorsal view; H, plantar view; I, distal view; J-L, a dasyurid (Dasycercus); J, dorsal view; K, plantar view; L, distal view. Abbreviations: AFi, astragalofibular facet; ampt, astragalar medial plantar tuberosity; AN, astragalonavicular facet; ATil, lateral astragalotibial facet; ATim, medial astragalotibial facet; CaA, calcaneoastragalar facet; CaAd, distal calcaneoastragalar facet; CLAJP, continuous lower ankle joint pattern; Su, sustentacular facet. Scale bars: 1 mm.