. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 25. Comparison of outline of holotypes of Unicapella. Significant differences are arrowed. A. U. stragulata sp. nov., SAM-PC6539, RV, locality 15-7, Mtubatuba, Coniacian IV, SEM 1948. B. U. sacsi SAM-K5610, BH9 Richards Bay, 88,39 m, Campanian II, SEM 343. Scale bars = 300/x. (i) Ventrolateral area: in U. stragulata the ornamentation consists of a large bulla and a smooth ridge, whereas in U. sacsi there is an additional large node between the bulla and ridge. (ii) Posterodorsal area: in U. stra
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 25. Comparison of outline of holotypes of Unicapella. Significant differences are arrowed. A. U. stragulata sp. nov., SAM-PC6539, RV, locality 15-7, Mtubatuba, Coniacian IV, SEM 1948. B. U. sacsi SAM-K5610, BH9 Richards Bay, 88,39 m, Campanian II, SEM 343. Scale bars = 300/x. (i) Ventrolateral area: in U. stragulata the ornamentation consists of a large bulla and a smooth ridge, whereas in U. sacsi there is an additional large node between the bulla and ridge. (ii) Posterodorsal area: in U. stragulata there is a short angled rib in the RV, which is lacking in U. sacsi, whereas in U. sacsi in both valves there are two small prominent punctate nodes immediately posterior of the posterodorsal bulla, (iii) Ornamentation of the anterior area: in U. sacsi there is a broad band of noticeably fine foveolate ornamentation bounded by the AM rim and a narrow primary rib line. This band is lacking in U. stragulata, which has a subtly different primary reticulation pattern, but no noticeable fining in the anteriormost secondary reticulation. The closeness of the two species strongly suggests that U. sacsi developed directly from U. stragulata by a slight reorganization of its ornamentation during late Santonian-early Campanian time. Dimensions (mm) length height PC6539 0,71 0,36 PC6540 0,70 0,38 PC6541 0,74 0,41. 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
