. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 131. Fig. 11. Texanites quinquenodosus (Redtenbacher). External suture of GBA 1873/01/13 (SV2569). x 6. material. The large specimens from Japan are said to differ from the lectotype in having the ventral (=external (5)) clavus displaced in front of the outer ventrolateral, but this is seen to some degree in GBA 1873/01/13 (SV 2569) (Fig. 9A-B, D), and is probably of limited significance. Texanites quinquenodosus most closely resembles Texanites collignoni Klinger
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 131. Fig. 11. Texanites quinquenodosus (Redtenbacher). External suture of GBA 1873/01/13 (SV2569). x 6. material. The large specimens from Japan are said to differ from the lectotype in having the ventral (=external (5)) clavus displaced in front of the outer ventrolateral, but this is seen to some degree in GBA 1873/01/13 (SV 2569) (Fig. 9A-B, D), and is probably of limited significance. Texanites quinquenodosus most closely resembles Texanites collignoni Klinger & Kennedy, 1980a ( = Texanites oliveti non Blanckenhorn sensu Col- lignon 1948, 1966; Matsumoto & Ueda 1962; Pop & Szasz 1973; Matsumoto 1978) from the Lower Santonian of Madagascar, Zululand, Japan, Romania, and possibly North America. The two species have comparable dimensions and rib densities on the outer whorls, but differ mainly in details of ornamentation. In T. quinquenodosus tuberculation is distinctly clavate, especially in the early stages of growth, whereas T. collignoni has more spinose ornament throughout. Furthermore, crowding of ribbing and decline of tuberculation towards the body chamber is not as common in T. collignoni as in T. quinquenodosus. Given more material with precise stratigraphic data, and taking the effects of differential preservation and intraspecific variation into account, specific sepa- ration of the two may prove unnecessary. For the present, however, the clavate tuberculation in T. quinquenodosus is regarded as being sufficient to separate it from T. 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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