Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 268
... known form from the Maastrichtian of Central Asia . It has a very narrow venter and , in many respects , resembles the early Placenticeras , with prominent umbilical tubercles but hardly any lateral ornament . Iljin ( 1958 ) maintained ...
... known form from the Maastrichtian of Central Asia . It has a very narrow venter and , in many respects , resembles the early Placenticeras , with prominent umbilical tubercles but hardly any lateral ornament . Iljin ( 1958 ) maintained ...
Page 351
species is known from the Cenomanian to Turonian of west and Central Europe . The combination of umbilical tubercles with a narrow , smooth , non - tuberculate venter seem sufficient at present to separate it from the mainstream of P ...
species is known from the Cenomanian to Turonian of west and Central Europe . The combination of umbilical tubercles with a narrow , smooth , non - tuberculate venter seem sufficient at present to separate it from the mainstream of P ...
Page 402
... known , thanks to Schlüter's fine figures , and they appear to be similar to those of Placenticeras . This genus therefore combines the external characters of Engonoceratidae with the sutural lines of Placenticeratidae , and perhaps ...
... known , thanks to Schlüter's fine figures , and they appear to be similar to those of Placenticeras . This genus therefore combines the external characters of Engonoceratidae with the sutural lines of Placenticeratidae , and perhaps ...
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