Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 264
... Parengonoceras and Hypengonoceras is by means of sutural ontogeny . Unequivocal adventive lobes occur in Parengonoceras ( Fig . 18 ) , which clearly places the genus in the family Engonoceratidae . As yet , the sutural ontogeny of ...
... Parengonoceras and Hypengonoceras is by means of sutural ontogeny . Unequivocal adventive lobes occur in Parengonoceras ( Fig . 18 ) , which clearly places the genus in the family Engonoceratidae . As yet , the sutural ontogeny of ...
Page 364
... Parengonoceras . Freely translated Renz stated that ' The suture lines seem to be of significant importance in distinguishing between Parengonoceras and Hypengonoceras . Reference is made to two illustrations of external sutures : the ...
... Parengonoceras . Freely translated Renz stated that ' The suture lines seem to be of significant importance in distinguishing between Parengonoceras and Hypengonoceras . Reference is made to two illustrations of external sutures : the ...
Page 365
... Parengonoceras and Hypen- gonoceras , there was never any doubt about the systematic placing of the former genus . Again we suspect that this systematic grouping had been influenced more by stratigraphy than natural affinities . Being ...
... Parengonoceras and Hypen- gonoceras , there was never any doubt about the systematic placing of the former genus . Again we suspect that this systematic grouping had been influenced more by stratigraphy than natural affinities . Being ...
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