Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 244
... form of whitfieldi . ' ' If , however , one admits that all American forms make up only one species , it becomes illogical to separate the European forms from each other or the American from them , and , consequently , all the forms of ...
... form of whitfieldi . ' ' If , however , one admits that all American forms make up only one species , it becomes illogical to separate the European forms from each other or the American from them , and , consequently , all the forms of ...
Page 253
... forms , such as ' Karamaites ' , dimor- phism is mainly restricted to size , whereas later forms , e.g. Santonian Placen- ticeras polyopsis ( Dujardin ) , have strongly differentiated dimorphic pairs , with microconchs having much ...
... forms , such as ' Karamaites ' , dimor- phism is mainly restricted to size , whereas later forms , e.g. Santonian Placen- ticeras polyopsis ( Dujardin ) , have strongly differentiated dimorphic pairs , with microconchs having much ...
Page 267
... forms with lateral ornament . In early forms , dimorphs differ mainly in size . Suture charac- teristically sagging , with saddle E / L deeply incised , and lateral lobe , L , arranged obliquely in adapical direction , whereas umbilical ...
... forms with lateral ornament . In early forms , dimorphs differ mainly in size . Suture charac- teristically sagging , with saddle E / L deeply incised , and lateral lobe , L , arranged obliquely in adapical direction , whereas umbilical ...
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