Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 278
... venter becomes tuberculate with distinct alternat- ing ventral clavi . Generally , as soon as the umbilical tubercles appear , the edges of the venter become crenulate . This is the ' subkaffrarium ' stage ( Figs 26-28 ) . ( d ) Late ...
... venter becomes tuberculate with distinct alternat- ing ventral clavi . Generally , as soon as the umbilical tubercles appear , the edges of the venter become crenulate . This is the ' subkaffrarium ' stage ( Figs 26-28 ) . ( d ) Late ...
Page 400
... Venter is smooth . On early whorls venter is smooth or crenulated , on middle and adult by means of two rows of highly crenulated tubercles , oblique in the side of the flanks and projecting over the ventral sides . The umbilicus is ...
... Venter is smooth . On early whorls venter is smooth or crenulated , on middle and adult by means of two rows of highly crenulated tubercles , oblique in the side of the flanks and projecting over the ventral sides . The umbilicus is ...
Page 402
... venter is smooth and flat , or slightly convex . Umbilical and marginal tubercles are always present in adult specimens . The flanks are covered with sickle - shaped ribs . In places , bifurcation usually produces tubercles or tubercle ...
... venter is smooth and flat , or slightly convex . Umbilical and marginal tubercles are always present in adult specimens . The flanks are covered with sickle - shaped ribs . In places , bifurcation usually produces tubercles or tubercle ...
Contents
List of species referred to Placenticeratidae | 384 |
Acknowledgements | 391 |
241 | 393 |
Copyright | |
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9 figs adult adventive lobe Albian ammonite Anaplacenticeras body chamber Campanian of Germany Cenomanian Cenomanian of Central Cenomanian-Turonian of India Central Asia Chiplonkar & Ghare Cobban Collignon 1965a compressed Coniacian diameter dimorphism Engonoceratidae flanks forms fritschi de Grossouvre genus Gissarites Grossouvre Hengestites holotype Hoplitidae Hoplitoplacenticeras Hypengonoceras decaryi Collignon Iljin incision India Chiplonkar intraspecific variation Karamaites Kennedy & Wright Klinger Knemiceras Kopetdagites Kossmat lateral lobe lateral ornament lateral tubercles lectotype Luppov Maastrichtian Macroconch Madagascar Metaplacenticeras Michailova Microconch with type ontogenetic ontogenetic changes ontogenetic stage Parengonoceras Paulcke phragmocone Placenticeras fritschi Placenticeras kaffrarium Etheridge Placenticeras polyopsis Dujardin Placenticeras syrtale Morton Placenticeratidae Proplacenticeras Reeside ribs rounded Ruzhentsev Santonian Santonian of France scaphitoid uncoiling Schlüter shell Spath Stantonoceras subkaffrarium sutural ontogeny suture line text-fig ticeras Turonian type 4 ornament Type species umbilical edge umbilical tubercles umbilical wall umbilicus Upper Albian Upper Campanian Upper Cretaceous ventral clavi whorl section Wiedmann Zululand