Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 243
... range of intraspecific variation in members of the ammonite family Placenticeratidae , combined with the effects of dimorphism and an extremely slow rate of evolutionary change in many lineages , has resulted in a large number of ...
... range of intraspecific variation in members of the ammonite family Placenticeratidae , combined with the effects of dimorphism and an extremely slow rate of evolutionary change in many lineages , has resulted in a large number of ...
Page 259
... range of the family . At the same time the genus Metaplacenticeras arose . It has approxi- mately the same stratigraphic range as Hoplitoplacenticeras but is said to differ in possessing a median keel at some stage of growth . This is ...
... range of the family . At the same time the genus Metaplacenticeras arose . It has approxi- mately the same stratigraphic range as Hoplitoplacenticeras but is said to differ in possessing a median keel at some stage of growth . This is ...
Page 358
... ranges in the Upper Campanian in Japan ( Matsumoto 1982a , 1982b ) , but in North America Hoplitoplacenticeras seems ... range of overlap . Matsumoto ( 1984 : 20–21 ) recently discussed the genus Metaplacenticeras and alleged that a true ...
... ranges in the Upper Campanian in Japan ( Matsumoto 1982a , 1982b ) , but in North America Hoplitoplacenticeras seems ... range of overlap . Matsumoto ( 1984 : 20–21 ) recently discussed the genus Metaplacenticeras and alleged that a true ...
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