Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 267
... flanks and smooth flat venter with sharp edges . Later stages may develop umbilical tubercles and generally ventral clavi , which are demonstrably the base of a septate spine in some ; lateral sickle - shaped ribs with or without ...
... flanks and smooth flat venter with sharp edges . Later stages may develop umbilical tubercles and generally ventral clavi , which are demonstrably the base of a septate spine in some ; lateral sickle - shaped ribs with or without ...
Page 400
... flanks . The umbilical tubercles are mammiform , pointed on the shell and blunt on internal casts . The external tubercles are elongated longitudinally . The ribs are always sickle - shaped , the most prominent are on the outer part of ...
... flanks . The umbilical tubercles are mammiform , pointed on the shell and blunt on internal casts . The external tubercles are elongated longitudinally . The ribs are always sickle - shaped , the most prominent are on the outer part of ...
Page 405
... flanks and the tubercles limiting the external region are very strong instead of being small . On the other hand , the suture shows a reduced number of elements , the saddles much larger and , as a result , fewer , widely separated ...
... flanks and the tubercles limiting the external region are very strong instead of being small . On the other hand , the suture shows a reduced number of elements , the saddles much larger and , as a result , fewer , widely separated ...
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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