Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 251
... phragmocone , or appearance of strong ornament on the body chamber following weak ornament on the phragmocone . The former commonly characterizes macroconchs , the latter microconchs . 3. Egression of the umbilical seam , leading to a ...
... phragmocone , or appearance of strong ornament on the body chamber following weak ornament on the phragmocone . The former commonly characterizes macroconchs , the latter microconchs . 3. Egression of the umbilical seam , leading to a ...
Page 278
... phragmocone stage ( Figs 11 , 23C - D ) . Here the form is at what may be termed as the ' umkwelanense ' stage , with very compressed whorls with maximum breadth at the umbilical shoulder . The flanks are smooth , save for fine ...
... phragmocone stage ( Figs 11 , 23C - D ) . Here the form is at what may be termed as the ' umkwelanense ' stage , with very compressed whorls with maximum breadth at the umbilical shoulder . The flanks are smooth , save for fine ...
Page 292
... phragmocone remains smooth . Weak , poorly developed umbilical tubercles only start appearing on the late adult phragmocone or on the adult body chamber . Again , there is considerable variation in the whorl section , as in type 1. NMB ...
... phragmocone remains smooth . Weak , poorly developed umbilical tubercles only start appearing on the late adult phragmocone or on the adult body chamber . Again , there is considerable variation in the whorl section , as in type 1. NMB ...
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