. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. UPPERMOST CENOMANIAN-BASAL TURONIAN AMMONITES FROM SALINAS, ANGOLA 65 Anagaudryceras cf. cassisianum (d'Orbigny, 1850) Figs 8-9, 10J, 11B-D Compare Ammonites cassisianus d'Orbigny, 1850: 146. Ammonites madraspatanum Stoliczka, 1865: 151, pi. 75 (fig. 2). Anagaudryceras madraspatanum (Stoliczka) Matsumoto, 1959a: 74, pi. 22 (fig. 3). Gaudryceras salinarium Douville, 1931: 42, pi. 1 (fig. 3), text-fig. 5. Description Two examples, one a juvenile and the other a fragment of an adult, both with recrystal
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. UPPERMOST CENOMANIAN-BASAL TURONIAN AMMONITES FROM SALINAS, ANGOLA 65 Anagaudryceras cf. cassisianum (d'Orbigny, 1850) Figs 8-9, 10J, 11B-D Compare Ammonites cassisianus d'Orbigny, 1850: 146. Ammonites madraspatanum Stoliczka, 1865: 151, pi. 75 (fig. 2). Anagaudryceras madraspatanum (Stoliczka) Matsumoto, 1959a: 74, pi. 22 (fig. 3). Gaudryceras salinarium Douville, 1931: 42, pi. 1 (fig. 3), text-fig. 5. Description Two examples, one a juvenile and the other a fragment of an adult, both with recrystallized test preserved, are close to d'Orbigny's Fig. 8. Anagaudryceras cassisianum (d'Orbigny). D'Orbigny's syntypes from the Cenomanian of Cassis, France. Photo: W. J. Kennedy, x 1. The juvenile example, SAM-PCA2769 (Fig. 11B-D), is very evolute (umbili- cus 46-50 % of diameter), with about one-sixth of the preceding whorl covered. The umbilicus is wide and shallow, with a steep umbilical wall and a well-rounded umbilical shoulder. The flanks are strongly convex and converge towards the evenly rounded venter. The ornament comprises extremely fine, indistinct, flexuous lirae which arise at the umbilical seam, pass forward across the umbilical wall, swing forward more strongly on the flanks, then recurve gently so as to cross the venter transversely. There appear to be occasional, very weak constrictions on the earliest whorls. SAM-PCA2726 (Fig. 10J) is a fragment of a mature individual. The whorl section is unknown. Ornament comprises fine lirae which arise at the umbilical seam and pass forward (prorsiradiate) to the umbilical shoulder where they increase by bifurcation and intercalation. The lirae are almost rectiradiate across the flank. A prominent collar, following much the same course as the lirae, splits into three fine ribs across the flanks. Although a much larger diameter, this specimen very closely resembles d'Orbigny's larger syntype of Ammonites cassisianu
Size: 2075px × 1205px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
