. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. EVOLUTION OF THE MAMMALIAN QUADRUPEDAL WALKING GAIT 39. 0[ PRpPU Fig. 9. Pedes in dorsal view, brought to the same length. a. Dimetrodon (after Romer). b. Hipposaurid. c. Dromasaur (after Broom), d. Pristerognathid. e. Anteosaurid. f. Titanosuchid. g. Tapinocephalid. h. Dicynodontid. and hipposaurids—the only theriodonts of the Tapinocephalus zone in which the tarsus is known, both bones are somewhat reduced in width. But of still greater importance is the fact that in the pristerognathids there is e
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. EVOLUTION OF THE MAMMALIAN QUADRUPEDAL WALKING GAIT 39. 0[ PRpPU Fig. 9. Pedes in dorsal view, brought to the same length. a. Dimetrodon (after Romer). b. Hipposaurid. c. Dromasaur (after Broom), d. Pristerognathid. e. Anteosaurid. f. Titanosuchid. g. Tapinocephalid. h. Dicynodontid. and hipposaurids—the only theriodonts of the Tapinocephalus zone in which the tarsus is known, both bones are somewhat reduced in width. But of still greater importance is the fact that in the pristerognathids there is evidence that the astragalus tends to overlie the preaxial edge of the calcaneum and in the hippo- saurids the calcaneum developed a pre-axially directed process which passed under the astragalus and is homologous with the mammalian sustentaculum tali. In the other therapsid groups the proximal part of the tarsus remained wide, with the calcaneum becoming even wider in the Dinocephalia, and the two bones continued to lie side by side without any tendency of overriding. Before the beginning of Tapinocephalus zone times the theriodonts had already experienced a further split. At this stage the hipposaurids developed a tuber calcis, whereas in the pristerognathids the facet for the fibula continued to form the most proximal part of the calcaneum. Unfortunately we do not know the tarsus in the other Tapinocephalus zone families of either the Gorgonopsia or of the Therocephalia and at present this split can only be considered to apply to the hipposaurids, which in other respects are also a rather aberrant Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
Size: 1857px × 1345px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
