Annals of the South African MuseumThe Museum, 1989 - Natural history |
From inside the book
Results 1-3 of 24
Page 278
... compressed , as in typical large Placenticeras . The nepionic constriction can be seen in NMB D941 / 7 ( Figs 9 , 23E - F ) . Unfortunately most of these specimens have undergone second- ary recrystallization , and details of the early ...
... compressed , as in typical large Placenticeras . The nepionic constriction can be seen in NMB D941 / 7 ( Figs 9 , 23E - F ) . Unfortunately most of these specimens have undergone second- ary recrystallization , and details of the early ...
Page 402
... compressed to slightly inflated whorl sections . The umbili- cus is narrow and funnel - shaped . The venter is smooth and flat , or slightly convex . Umbilical and marginal tubercles are always present in adult specimens . The flanks ...
... compressed to slightly inflated whorl sections . The umbili- cus is narrow and funnel - shaped . The venter is smooth and flat , or slightly convex . Umbilical and marginal tubercles are always present in adult specimens . The flanks ...
Page 407
... compressed to circular with venter flattish narrow to broad feebly convex . Suture of typically Placenticeras type has few elements as in Proplacenticeras . Fewer but stronger ventral clavi distinguish this genus from Stantonoceras ...
... compressed to circular with venter flattish narrow to broad feebly convex . Suture of typically Placenticeras type has few elements as in Proplacenticeras . Fewer but stronger ventral clavi distinguish this genus from Stantonoceras ...
Contents
List of species referred to Placenticeratidae | 384 |
Acknowledgements | 391 |
241 | 393 |
Copyright | |
1 other sections not shown
Other editions - View all
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