. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 194 P. Hershkovitz. Plate V: Calcanei, not to scale, greatest length in mm [brackets]; right calcaneus of Didelphis virginiana (FMNH 108696) [] and right calcaneus of Phalanger orientalis (FMNH 60402) []; f = medial cuboid facet extension. Taxonomic and locomotor significance of ankle bone articular patterns Confutation of ankle joint bone patterns as criteria for separation between Szalay's concept of Ameridelphia and Australidelphia does not invalidate tho
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 194 P. Hershkovitz. Plate V: Calcanei, not to scale, greatest length in mm [brackets]; right calcaneus of Didelphis virginiana (FMNH 108696) [] and right calcaneus of Phalanger orientalis (FMNH 60402) []; f = medial cuboid facet extension. Taxonomic and locomotor significance of ankle bone articular patterns Confutation of ankle joint bone patterns as criteria for separation between Szalay's concept of Ameridelphia and Australidelphia does not invalidate those patterns as taxonomic states of lower hierarchies of marsupials. Both patterns, it is shown (Table 1), occur among Australian marsupials. The S pattern present in astragalus and calcaneus of the Peramelidae and Macropodidae supports separation of those two Australian families from others where the C pattern prevails. IVIodifications of the pattern of each bone within each family group may also prove distinctive at subfami- ly or generic levels. The virtually consistent presence of pattern C in the calcaneus of the American Marmosinae distinguishes that taxon from nearly all other marmosids. The same may be said for the pecuhar Lestodelphyinae (1 species) also with a C calcaneal pattern but differing most notably by its short, incrassate, nonprehensile tail, and complete tympanic buha. The Caluromyidae depart widely from the Didelphidae with its C pattern calcaneus combined with a suite of distinctive non-tarsal characters including distinct karyotype and retention of the cloaca (ehminated in Didelphidae). Persistence of the primitive S or intermediate pattern in calcanei and S pattern in astragali of the otherwise grossly different Thylamys, Metachirus and Monodelphis, does not reflect on the taxonomic disassociation of one from the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap
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