. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . absence of articulatory areas on the ilium) does not support this view, it is true thatthe first two caudal vertebrae are laterally flanked by the posterior part of the iliac blade. TABLE 2 Variation in dimensions of caudal vertebrae in Erythrosuchus africanus, specimen BMNH R3592. The dimensions a-i are defined in Figure 19. Position Dimensions (mm) a b c d e h i 1 63 87 71 86 70 76 50 2 62 78 67 76 80 3 68 64 4 58 72 71 5 55 68 66 67 6 54 67 67 64 7 53 66 63 61 77 50 8 54 61 60 58 75 48 9 53 57 53 52 75 43 10 52 5
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . absence of articulatory areas on the ilium) does not support this view, it is true thatthe first two caudal vertebrae are laterally flanked by the posterior part of the iliac blade. TABLE 2 Variation in dimensions of caudal vertebrae in Erythrosuchus africanus, specimen BMNH R3592. The dimensions a-i are defined in Figure 19. Position Dimensions (mm) a b c d e h i 1 63 87 71 86 70 76 50 2 62 78 67 76 80 3 68 64 4 58 72 71 5 55 68 66 67 6 54 67 67 64 7 53 66 63 61 77 50 8 54 61 60 58 75 48 9 53 57 53 52 75 43 10 52 53 49 49 72 45 11 51 50 47 46 72 43 12 49 48 43 43 70 36 13 48 45 42 42 69 35 14 48 38 39 69 34 15 48 38 38 69 16 47 38 35 36 65 30 17 46 35 34 65 29 18 44 35 34 35 61 28 19 44 34 31 58 27 20 43 30 33 31 26 21 42 32 30 34 32 53 26 22 40 33 30 31 30 53 25 23 39 31 29 28 28 47 23 24 39 30 28 28 26 22 25 29 26 26 38 27 26 50 27 37 26 26 49 19 28 35 24 24 46 19 29 34 23 26 23 30 21 31 20 19 32 30 18 19 18 33 19 17 34? 23 14 16 13 35 OSTEOLOGY OF ERYTHROSUCHUS AFRICANUS BROOM 49. Figure 25 Erythrosuchus africanus, sacral vertebrae and ribs of BMNH R3592. A. Anterior view. B. Posterior view. Several changes occur over the following eight or so caudal vertebrae (Fig. 27A,Table 2). There is a proportional lengthening of the centra up to a point where the centrumof the tenth caudal vertebra is longer than it is high. This is accompanied by a decrease inthe absolute length and diameter of the centra. There is also a reduction in the expressionof lateral constriction. The ventral edge remains arched, but the keel is reduced, and theventral surface becomes a broad and almost flat area. The bevelling on the posteroventraledge of the centra becomes kidney-shaped for articulation with haemal arches. Thecontact areas for ribs decrease in size, and are positioned lower down on the articulatory surfaces of the zygapophyses become longer and narrower, and are at agreater angle to one
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