Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 268
... separated from Placenticeras . Due to the great variation in this character , we do not believe that separation on details of the suture is advisable . Another poorly known taxon that probably does not require generic separation from ...
... separated from Placenticeras . Due to the great variation in this character , we do not believe that separation on details of the suture is advisable . Another poorly known taxon that probably does not require generic separation from ...
Page 400
... separation and transformation into independent lobes . On the first whorl , in the base of the first umbilical lobe , two notches arise of which the outer one lags somewhat in development . On the second whorl a notch arises on the ...
... separation and transformation into independent lobes . On the first whorl , in the base of the first umbilical lobe , two notches arise of which the outer one lags somewhat in development . On the second whorl a notch arises on the ...
Page 401
... separation and transformation into independent lobes later on . On the second whorl , a notch develops in the outer ... separated , lateral extensions , ventral lobes , and 8-9 strongly separated lobes , alternating with bifid blunt ...
... separation and transformation into independent lobes later on . On the second whorl , a notch develops in the outer ... separated , lateral extensions , ventral lobes , and 8-9 strongly separated lobes , alternating with bifid blunt ...
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