Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 253
... strongly differentiated dimorphs , it should be reduced to a synonym of Placenticeras . Recent work by Seyed - Emami et al . ( 1984 ) suggests that some early ( Middle Cenomanian ) placenticeratids are already strongly dimorphic ...
... strongly differentiated dimorphs , it should be reduced to a synonym of Placenticeras . Recent work by Seyed - Emami et al . ( 1984 ) suggests that some early ( Middle Cenomanian ) placenticeratids are already strongly dimorphic ...
Page 268
... strongly differentiated dimorphs can be distinguished . In the Turonian to Coniacian ' Proplacenticeras ' , strong ... Strongly ornamented microconchs correspond to Collignon's ( 1965a ) genus Parastantonoceras . In later Placenticeras ...
... strongly differentiated dimorphs can be distinguished . In the Turonian to Coniacian ' Proplacenticeras ' , strong ... Strongly ornamented microconchs correspond to Collignon's ( 1965a ) genus Parastantonoceras . In later Placenticeras ...
Page 401
... strongly separated , lateral extensions , ventral lobes , and 8-9 strongly separated lobes , alternating with bifid blunt saddles . The dorsal lobes are peak - shaped . The distinctly expressed slant of the first lobe ( from the ventral ...
... strongly separated , lateral extensions , ventral lobes , and 8-9 strongly separated lobes , alternating with bifid blunt saddles . The dorsal lobes are peak - shaped . The distinctly expressed slant of the first lobe ( from the ventral ...
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