Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 292
... narrow in extreme cases , without an intermediate tubercu- late stage . There is considerable variation in the whorl section , ranging from extremely compressed , subtrigonal with flat flanks converging to a narrow venter , e.g. SAM ...
... narrow in extreme cases , without an intermediate tubercu- late stage . There is considerable variation in the whorl section , ranging from extremely compressed , subtrigonal with flat flanks converging to a narrow venter , e.g. SAM ...
Page 400
... narrow , funnel - shaped umbilicus , smooth venter and slightly curved flanks . The umbilical tubercles are mammiform , pointed on the shell and blunt on internal casts . The external tubercles are elongated longitudinally . The ribs ...
... narrow , funnel - shaped umbilicus , smooth venter and slightly curved flanks . The umbilical tubercles are mammiform , pointed on the shell and blunt on internal casts . The external tubercles are elongated longitudinally . The ribs ...
Page 404
... narrow umbilicus and wedge - shaped whorl section . Maximum width is located at the umbilical edge or on the lower third of the flanks . On internal casts the siphonal side is pointed in the form of a flat keel ; in shelly preservation ...
... narrow umbilicus and wedge - shaped whorl section . Maximum width is located at the umbilical edge or on the lower third of the flanks . On internal casts the siphonal side is pointed in the form of a flat keel ; in shelly preservation ...
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