. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . =5 s ^ 03 co. s ! OSTEOLOGY OF ERYTHROSUCHUS AFRICANUS BROOM 25 described here reflects a deep contact and might contribute to a clearer definition of amore satisfactorily discrete character state. The descending ramus of the squamosal (Figs 2, 10) is much longer than the anteriorone. Towards its ventral edge the posterior margin of this ramus bears a laterallyoverhanging pleat or tuck (Fig. 10). This overhanging part forms a free-standing posterioredge that sheaths laterally the dorsal part of the quadrate. The par
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . =5 s ^ 03 co. s ! OSTEOLOGY OF ERYTHROSUCHUS AFRICANUS BROOM 25 described here reflects a deep contact and might contribute to a clearer definition of amore satisfactorily discrete character state. The descending ramus of the squamosal (Figs 2, 10) is much longer than the anteriorone. Towards its ventral edge the posterior margin of this ramus bears a laterallyoverhanging pleat or tuck (Fig. 10). This overhanging part forms a free-standing posterioredge that sheaths laterally the dorsal part of the quadrate. The part of the squamosal that isoverhung continues ventrally to articulate with a depression on the lateral surface of thequadratojugal. This squamosal pleat is perhaps restricted among the earliest archosaurs tothe erythrosuchids Erythrosuchus and Shansisuchus (personal observation of IVPPmaterial). The ventral process of the squamosal of E. africanus extends down towards theposterior process of the jugal, and almost (BMNH R3592, BPI 4680) excludes thequadratojugal from the border of the late
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
