. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . 20 mm Figure 20 D Erythrosuchus africanus. A. Medial and lateral views of right atlas neural arch of BPI4680. B. Anterior and posterior views of atlas intercentrum of BPI 4680. C. Medial and lateral views of right atlas neural arch of BMNH R3592. D. Anterior and posterior views of atlas intercentrum of BMNH R3592. projection on the atlas neural arch, articulatory facets on the exoccipitals, and by thepresence of a proatlas in other early archosaurs. The neural arch of the atlas (Fig. 20A, C) consists of a main body
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . 20 mm Figure 20 D Erythrosuchus africanus. A. Medial and lateral views of right atlas neural arch of BPI4680. B. Anterior and posterior views of atlas intercentrum of BPI 4680. C. Medial and lateral views of right atlas neural arch of BMNH R3592. D. Anterior and posterior views of atlas intercentrum of BMNH R3592. projection on the atlas neural arch, articulatory facets on the exoccipitals, and by thepresence of a proatlas in other early archosaurs. The neural arch of the atlas (Fig. 20A, C) consists of a main body with a small anteriorprojection and a longer, tapering posterior process. The arches are paired and unfused,with the gap between them being partly overhung by the axis neural spine. The element asa whole is laterally convex and medially concave. The main part of the arch contacting theatlas intercentrum is short, broad, and transversely thick. The anterior edge forms an areafor articulation with the occipital condyle. The anterior projection arises dorsally, justbehind the
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
