Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 263
... incision of the saddle E / L . The time of formation seems to be crucial for definition . According to Schindewolf ( 1967 : 803 ( 725 ) ) the umbilical lobes are formed at an early ontogenetic stage - prior to incision of the saddles ...
... incision of the saddle E / L . The time of formation seems to be crucial for definition . According to Schindewolf ( 1967 : 803 ( 725 ) ) the umbilical lobes are formed at an early ontogenetic stage - prior to incision of the saddles ...
Page 264
... incision of the lateral saddle E / L in the latter . The lobe in the saddle L / U2 ( fourth lateral lobe ) , termed U1n by Michailova ( 1974 , 1978 ) , has been used as a criterion for separating genera in the Placenti- ceratidae . We ...
... incision of the lateral saddle E / L in the latter . The lobe in the saddle L / U2 ( fourth lateral lobe ) , termed U1n by Michailova ( 1974 , 1978 ) , has been used as a criterion for separating genera in the Placenti- ceratidae . We ...
Page 357
... incision . The adult sutures vary considerably and , according to Paulcke , the variation is largely determined by the whorl section and ornament . In those forms with inflated whorl section and strong ornament , e.g. H. p . hauthali ...
... incision . The adult sutures vary considerably and , according to Paulcke , the variation is largely determined by the whorl section and ornament . In those forms with inflated whorl section and strong ornament , e.g. H. p . hauthali ...
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