Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 268
... separated from Placenticeras . Due to the great variation in this character , we do not believe that separation on details of the suture is advisable . Another poorly known taxon that probably does not require generic separation from ...
... separated from Placenticeras . Due to the great variation in this character , we do not believe that separation on details of the suture is advisable . Another poorly known taxon that probably does not require generic separation from ...
Page 400
... separated by means of asymmetrical bases of the first three and by a wide , denticulated base at the posterior . The ... separation and transformation into independent lobes . On the first whorl , in the base of the first umbilical lobe ...
... separated by means of asymmetrical bases of the first three and by a wide , denticulated base at the posterior . The ... separation and transformation into independent lobes . On the first whorl , in the base of the first umbilical lobe ...
Page 401
... separation and transformation into independent lobes later on . On the second whorl , a notch develops in the outer segment ... separated lobes , alternating with bifid blunt saddles . The dorsal lobes are peak - shaped . The distinctly ...
... separation and transformation into independent lobes later on . On the second whorl , a notch develops in the outer segment ... separated lobes , alternating with bifid blunt saddles . The dorsal lobes are peak - shaped . The distinctly ...
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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