. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. C^ttft. Fig. 22. Anisoceras haasi sp. nov. Dorsal and lateral views of a slightly crushed composite internal mould, SAM-PCA2952, from Egito. xl. more coarsely ribbed, with ribs arising in bundles from distinctly bullate dorso- lateral tubercles. Juveniles of A. pseudoelegans also appear to be much more coarsely ribbed than the present material (compare Renz 1968, pi. 14 (figs 10-11)). According to Kennedy (1971: 12, pi. 3 (figs 12-13), pi. 4 (figs 1-3)), Anisoceras plicatile is a Middle Cenomanian sp
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. C^ttft. Fig. 22. Anisoceras haasi sp. nov. Dorsal and lateral views of a slightly crushed composite internal mould, SAM-PCA2952, from Egito. xl. more coarsely ribbed, with ribs arising in bundles from distinctly bullate dorso- lateral tubercles. Juveniles of A. pseudoelegans also appear to be much more coarsely ribbed than the present material (compare Renz 1968, pi. 14 (figs 10-11)). According to Kennedy (1971: 12, pi. 3 (figs 12-13), pi. 4 (figs 1-3)), Anisoceras plicatile is a Middle Cenomanian species with 12 fine ribs in a distance equal to the whorl height, and a circular whorl section. 2 or 3 ribs are looped between the midlateral and ventrolateral tubercles and are separated by 1-3 non-tuberculate intercalatories. Anisoceras plicatile differs from the present material, therefore, in having much more swollen main ribs and a much more prominent lateral tubercle which is at the middle of the flank, not dorso- lateral as in A. haasi. The Angolan species also has more numerous, fine intercalatories, whilst the ribbing is not as coarse in maturity as it is in A. plicatile (compare Kennedy 1971, pi. 2 (fig. 12)). Anisoceras bendirei (Adkins) (1920: 8, pi. 11 (fig. 1)) from the late Albian of Texas differs from the Angolan material in being much more coarsely ribbed, with the lateral tubercle higher on the flanks. Anisoceras raynaudi (Boule, Lemoine & Thevenin 1907: 170, pi. 4 (figs 7-8), fig. 38) is a finely ribbed species in maturity, which differs from A. haasi in having fewer intercalatories (only 2-3) between looped ribs in the early growth stages, a more prominent dorsolateral tubercle and, judging from material from Catuane, southern Mozambique, in the South African Museum, Cape Town, 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 ma
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
