. Breviora. fib art surf. Figure 1 I. The right astragalus and calcaneum of Euparkeria. A) astragalus; B) calcaneum; and C) astragalus and calcaneum in articulation. A and B from Bonaparte (1975), C based on drawings of South African Museum specimen SAM 6049 made by J. Bonaparte. Abbreviations: ast art surf, astragala/ articular surface; cal tub, calcaneal tuber; fib art surf, fibular articular surface; tib art surf, tibial articular surface. A general similarity between the tarsus of Erythrosuchus and Euparkeria is present, but this can be attributed to the poor ossification of the bones. Mor
. Breviora. fib art surf. Figure 1 I. The right astragalus and calcaneum of Euparkeria. A) astragalus; B) calcaneum; and C) astragalus and calcaneum in articulation. A and B from Bonaparte (1975), C based on drawings of South African Museum specimen SAM 6049 made by J. Bonaparte. Abbreviations: ast art surf, astragala/ articular surface; cal tub, calcaneal tuber; fib art surf, fibular articular surface; tib art surf, tibial articular surface. A general similarity between the tarsus of Erythrosuchus and Euparkeria is present, but this can be attributed to the poor ossification of the bones. More fundamental is the similarity between the tarsus of Erythrosuchus and Chasmatosaurus. A comparison of the calcaneum of these two animals (Fig. 12) shows that the calcaneal tuber extends laterally, has thin proximal and distal edges, and has a thickened medial buttress that extends across the tuber to an expanded cartilage-covered lateral edge. The poor ossification of the astragalus of Erythrosuchus obscured the structure of the articulation between the astragalus and 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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