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abbreviations Africa Ammonites appears arise Astieria atherstoni Sharpe authors baini baini Sharpe Barnard Baumberger bearing become body body chamber Broom bundles close collected compressed considered described Description designated diameter Dicynodon differs Diictodon dimorphism distinguished dorsal example Family fauna Feresa figured Formation forms front genus give holotype illustrations Imlay included inflated inner whorls intercalated ribs Kitchin known lacking lateral views length Locality lower macroconch male margin material narrow Neocomian Note Olcostephanus Olcostephanus original outer whorl parabolae Pereopod peristome portion posterior present primaries prominent recorded references represent Rogersites rostrum rounded rursiradiate secondary ribs segment separates Sharpe short shows similar single Skull slightly Smith South African Museum Spath species spines stage strongly Sundays River tables terminate tubercles Type specimen umbilical bullae umbilical shoulder umbilicus Upper Valanginian Vema venter ventral whorl section Zone