Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 253
... distinct dimorphic pairs , macroconchs retaining weaker ornament to greater diameters than the strongly ornamented microconchs . However , distinct dimorphic pairs that differ only in terms of relative size also occur . Thus dimorphism ...
... distinct dimorphic pairs , macroconchs retaining weaker ornament to greater diameters than the strongly ornamented microconchs . However , distinct dimorphic pairs that differ only in terms of relative size also occur . Thus dimorphism ...
Page 258
... 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 the stage at which size related dimorphism gave way to ...
... 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 the stage at which size related dimorphism gave way to ...
Page 404
... distinct . In Anaplacenticeras gen . n . the siphonal side is flat as distinct from the pointed or strongly rounded one of the genus Cleoniceras Parona & Bonarelli . The suture line of Anaplacenticeras gen . n . has more massive lobes ...
... distinct . In Anaplacenticeras gen . n . the siphonal side is flat as distinct from the pointed or strongly rounded one of the genus Cleoniceras Parona & Bonarelli . The suture line of Anaplacenticeras gen . n . has more massive lobes ...
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