Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 253
... ornament , the umbilical tubercles migrate away from the umbilical edge towards maturity and weaken , or even disappear . Conversely , forms with smooth phragmocones may suddenly develop weak umbilical and lateral ornament on the body ...
... ornament , the umbilical tubercles migrate away from the umbilical edge towards maturity and weaken , or even disappear . Conversely , forms with smooth phragmocones may suddenly develop weak umbilical and lateral ornament on the body ...
Page 258
... ornament . Ornament - related dimorphism becomes obvious only when distinct lateral orna- ment , especially lateral tubercles , developed - on present evidence , mainly during the Turonian and Coniacian . At present it is not possible ...
... ornament . Ornament - related dimorphism becomes obvious only when distinct lateral orna- ment , especially lateral tubercles , developed - on present evidence , mainly during the Turonian and Coniacian . At present it is not possible ...
Page 268
... ornament , shown best by P. kaffrarium , where strongly differentiated dimorphs can be distinguished . In the Turonian to Coniacian ' Proplacenticeras ' , strong lateral ornament develops and in the adult stage the umbilical tubercles ...
... ornament , shown best by P. kaffrarium , where strongly differentiated dimorphs can be distinguished . In the Turonian to Coniacian ' Proplacenticeras ' , strong lateral ornament develops and in the adult stage the umbilical tubercles ...
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Common terms and phrases
adult adventive lobe Albian ammonites Atlantic Benson body chamber bottom depth Campanian Cape Town catch rates Cenomanian Central Asia Chiplonkar & Ghare compressed Coniacian continental diameter Diaphus dimorphism distribution Engonoceratidae fauna flanks genus Group holotype Hoplitoplacenticeras Hulley Hyatt Hypengonoceras decaryi Collignon Iljin intraspecific variation isobath Karamaites Kennedy & Wright Klinger Lampanyctodes hectoris lanternfish lateral lobe lateral ornament lateral tubercles Maastrichtian Macroconch Madagascar Marine Metaplacenticeras Michailova Microconch with type myctophid oceanic ontogenetic changes ontogeny Orange Shelf ostracod Parengonoceras Paulcke pelagic phragmocone Placenticeras kaffrarium Etheridge Placenticeras polyopsis Placenticeratidae polyopsis Dujardin Proplacenticeras pseudoceanic ribs saddle Santonian separated Shannon shell smooth South African Museum south-western Africa southern Benguela region Spath specimens specimens.h¹ stage stations subkaffrarium sutural ontogeny suture suture line SW Cape temperature text-fig Turonian Type species umbilical tubercles umbilicus umkwelanense Upper Albian Upper Campanian Upper Cretaceous upwelling venter ventral clavi Whatley whorl section Wiedmann Zululand