. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. UPPERMOST CENOMANIAN-BASAL TURONIAN AMMONITES FROM SALINAS, ANGOLA 63. Fig. 7. Gaudryceras {Gaudryceras) isovokyense Collignon. Whorl section of SAM-PCA2713. xl. Measurements No. D H W W/H Ui SAM-PCA2713 74 25 (34) 28 (38) 1,12 29 (26) 55 54 17(31) 21 (39) 1,23 25 (22) 55 37 11 (30) 17 (46) 1,55 21 (18) Discussion So far as can be judged, the penultimate whorl of the Salinas example is identical with the holotype of G. isovokyense from the Cenomanian 'Zone a Mantelliceras mantelli et Calycoceras newb
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. UPPERMOST CENOMANIAN-BASAL TURONIAN AMMONITES FROM SALINAS, ANGOLA 63. Fig. 7. Gaudryceras {Gaudryceras) isovokyense Collignon. Whorl section of SAM-PCA2713. xl. Measurements No. D H W W/H Ui SAM-PCA2713 74 25 (34) 28 (38) 1,12 29 (26) 55 54 17(31) 21 (39) 1,23 25 (22) 55 37 11 (30) 17 (46) 1,55 21 (18) Discussion So far as can be judged, the penultimate whorl of the Salinas example is identical with the holotype of G. isovokyense from the Cenomanian 'Zone a Mantelliceras mantelli et Calycoceras newboldV of Madagascar (Collignon 1964). Gaudryceras varagurense Kossmat (1895: 122, pi. 17 (fig. 4), pi. 18 (figs 2a-c)), known from the Cenomanian to uppermost Campanian, differs from G. isovokyense in retaining an evenly rounded venter throughout ontogeny, having more frequent flared ribs and in that the rib density remains the same across the venter. Gaudryceras stefaninii (Venzo) (1936: 21, pi. 2 (figs 3-4)) from the Cenoma- nian of Zululand bears a close resemblance to the Angolan material. This species differs, however, in having much finer, denser, Vertebrites-like ribbing across the venter. Gaudryceras vertebratum Kossmat (1895: 126, pi. 15 (figs 4-5)) shows a flattened venter which is apparently 'smooth', with prorsiradiate lirae on the flanks. Gaudryceras (Vertebrites) murdochi (Marshall) (Henderson 1970: 22, pi. 3 (fig. 1)) is an Upper Campanian species, very evolute, serpenticone with strongly depressed whorls and a broad flat venter. Gaudryceras varicostatum (van Hoepen) (1921: 7, pi. 2 (figs 10-12)) shows dense fine lirae across the venter, but the latter is not nearly so flattened as in. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
