Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 253
... distinct dimorphic pairs , macroconchs retaining weaker ornament to greater diameters than the strongly ornamented microconchs . However , distinct dimorphic pairs that differ only in terms of relative size also occur . Thus dimorphism ...
... distinct dimorphic pairs , macroconchs retaining weaker ornament to greater diameters than the strongly ornamented microconchs . However , distinct dimorphic pairs that differ only in terms of relative size also occur . Thus dimorphism ...
Page 258
... distinct lateral orna- ment , especially lateral tubercles , developed - on present evidence , mainly during the Turonian and Coniacian . At present it is not possible to pinpoint the stage at which size related dimorphism gave way to ...
... distinct lateral orna- ment , especially lateral tubercles , developed - on present evidence , mainly during the Turonian and Coniacian . At present it is not possible to pinpoint the stage at which size related dimorphism gave way to ...
Page 305
... distinct umbilical and lateral ornament of typical ' kaffrarium ' type . The venter changes from flat and smooth to tuberculate to rounded and smooth , or directly from flat and smooth to rounded and smooth without an intermediate ...
... distinct umbilical and lateral ornament of typical ' kaffrarium ' type . The venter changes from flat and smooth to tuberculate to rounded and smooth , or directly from flat and smooth to rounded and smooth without an intermediate ...
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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.hı 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