Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 400
... 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 are always sickle - 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 are always sickle - shaped ...
Page 402
... umbilicus on the second whorl , an umbilical lobe arises which shifts to the external side . The lobes originating in the area of the umbilicus , either undergo double division or remain undivided and shift on to the external or ...
... umbilicus on the second whorl , an umbilical lobe arises which shifts to the external side . The lobes originating in the area of the umbilicus , either undergo double division or remain undivided and shift on to the external or ...
Page 404
... umbilicus , very small umbilical tubercles , and a distinct umbilical edge . The last two characteristics connect the genus with the genus Proplacen- ticeras Spath , but the suture lines in these genera are different . ( Free ...
... umbilicus , very small umbilical tubercles , and a distinct umbilical edge . The last two characteristics connect the genus with the genus Proplacen- ticeras Spath , but the suture lines in these genera are different . ( Free ...
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