Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 258
... Ornament - related dimorphism becomes obvious only when distinct lateral orna- ment , especially lateral tubercles , developed - on present evidence , mainly during the Turonian and Coniacian . At present it is not possible to pinpoint ...
... Ornament - related dimorphism becomes obvious only when distinct lateral orna- ment , especially lateral tubercles , developed - on present evidence , mainly during the Turonian and Coniacian . At present it is not possible to pinpoint ...
Page 268
... lateral ornament develops and in the adult stage the umbilical tubercles may migrate outwards , foreshadowing the Santonian Placenticeras polyopsis type of ornament . Strongly ornamented microconchs correspond to Collignon's ( 1965a ) ...
... lateral ornament develops and in the adult stage the umbilical tubercles may migrate outwards , foreshadowing the Santonian Placenticeras polyopsis type of ornament . Strongly ornamented microconchs correspond to Collignon's ( 1965a ) ...
Page 305
... ornament becomes quite bold , with distinct umbilical and lateral ornament of typical ' kaffrarium ' type . The venter changes from flat and smooth to tuberculate to rounded and smooth , or directly from flat and smooth to rounded and ...
... ornament becomes quite bold , with distinct umbilical and lateral ornament of typical ' kaffrarium ' type . The venter changes from flat and smooth to tuberculate to rounded and smooth , or directly from flat and smooth to rounded and ...
Contents
List of species referred to Placenticeratidae | 384 |
Acknowledgements | 391 |
241 | 393 |
Copyright | |
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Common terms and phrases
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