Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 249
... present ) may migrate outward , in some up to midflank , and the venter becomes distinctly rounded and eventually may be completely smooth on the body chamber with no ventral clavi , if these were present initially . In addition , the ...
... present ) may migrate outward , in some up to midflank , and the venter becomes distinctly rounded and eventually may be completely smooth on the body chamber with no ventral clavi , if these were present initially . In addition , the ...
Page 292
... present collection , the last septum is formed at diameters between 110 and 120 mm , whereas macroconchs show a wider range of maximum diameter , but generally form the last septum at between 150 and 185 mm . The length of the body ...
... present collection , the last septum is formed at diameters between 110 and 120 mm , whereas macroconchs show a wider range of maximum diameter , but generally form the last septum at between 150 and 185 mm . The length of the body ...
Page 358
... present it seems advisable to retain the two genera , though fully aware of the range of overlap . Matsumoto ( 1984 : 20–21 ) recently discussed the genus Metaplacenticeras and alleged that a true adventive lobe ( A ) was present in the ...
... present it seems advisable to retain the two genera , though fully aware of the range of overlap . Matsumoto ( 1984 : 20–21 ) recently discussed the genus Metaplacenticeras and alleged that a true adventive lobe ( A ) was present in the ...
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