. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 10 ANNALS OF THE SOUTH AFRICAN MUSEUM. 5 mm _J Fig. 3. Lechifes gaudini (Pictet & Campiche, 1861). Suture line of SAM-PCZ8766. Scale bar for size. Genus Sciponoceras Hyatt, 1894 {= Cyrtochilus Meek, 1876, non Jakowlew, 1875; Cyrtochilella Strand, 1929) Type species: Hamites baculoides Mantell, 1822: 123, pi. 23 (figs 6-7), by the original designation of Hyatt (1894: 578). Diagnosis According to the most comprehensive, recent review by Wright & Kennedy (1981: 112), 'Sciponoceras is distinguish
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 10 ANNALS OF THE SOUTH AFRICAN MUSEUM. 5 mm _J Fig. 3. Lechifes gaudini (Pictet & Campiche, 1861). Suture line of SAM-PCZ8766. Scale bar for size. Genus Sciponoceras Hyatt, 1894 {= Cyrtochilus Meek, 1876, non Jakowlew, 1875; Cyrtochilella Strand, 1929) Type species: Hamites baculoides Mantell, 1822: 123, pi. 23 (figs 6-7), by the original designation of Hyatt (1894: 578). Diagnosis According to the most comprehensive, recent review by Wright & Kennedy (1981: 112), 'Sciponoceras is distinguished ... by its marked constrictions. These are straight and prorsiradiate in early forms but in later ones are rursi- radiate on the inner quarter or third of the flank and then turn forward. There are also well-marked, weakly branching ribs on the body chamber or the whole shell, following the same course as the constrictions. The apertural features appear to be of specific as well as sexual significance; some are relatively simple, others have a long rostrum, broad folds and a high collar, others have long lateral lappets.' Discussion Extensive discussions on Sciponoceras are given by Matsumoto (1959), Matsumoto & Obata (1963), Kennedy (1971), Cobban & Scott (1972), Wright (1979), Wright & Kennedy (1981), Kennedy & Juignet (1983) and Wright & Kennedy (1995), and nothing new can be added to these. Occurrence Transitions from Lechites to Sciponoceras first occur in the Upper Albian Stoliczkaia dispar Zone faunas of the Anglo-Paris Basin. The genus extends to the Upper Turonian. The genus has a world-wide distribution (see Matsumoto. 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
