Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 262
... ( adventive ) of Wedekind . Furthermore , in Placenticeras s.s. a new lobe arises in the saddle L / U2 ( Ruzhentsev ... adventive lobe ' . As per definition , an adventive lobe is a true lobe formed in the external saddle ( E / L ) at an ...
... ( adventive ) of Wedekind . Furthermore , in Placenticeras s.s. a new lobe arises in the saddle L / U2 ( Ruzhentsev ... adventive lobe ' . As per definition , an adventive lobe is a true lobe formed in the external saddle ( E / L ) at an ...
Page 263
... adventive lobe as per definition , or merely a deep incision of the saddle E / L . The time of formation seems to be ... adventive lobes . According to Michailova ( 1978 ) the ' adventive ' lobe only arises from the end of the second ...
... adventive lobe as per definition , or merely a deep incision of the saddle E / L . The time of formation seems to be ... adventive lobes . According to Michailova ( 1978 ) the ' adventive ' lobe only arises from the end of the second ...
Page 264
... adventive lobes occur in Parengonoceras ( Fig . 18 ) , which clearly places the genus in the family Engonoceratidae . As yet , the sutural ontogeny of Hypengonoceras is unknown , and reference to the Placenticeratidae appears to be ...
... adventive lobes occur in Parengonoceras ( Fig . 18 ) , which clearly places the genus in the family Engonoceratidae . As yet , the sutural ontogeny of Hypengonoceras is unknown , and reference to the Placenticeratidae appears to be ...
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