Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 381
... narrow , flattened venter . Ontogenetic change in whorl section is best seen in PCZ6278 ( Fig . 124 ) and PCZ6274 ( Figs 116-117 ) . During the ontogeny the maximum whorl breadth migrates from near the umbilical edge to near the dorsal ...
... narrow , flattened venter . Ontogenetic change in whorl section is best seen in PCZ6278 ( Fig . 124 ) and PCZ6274 ( Figs 116-117 ) . During the ontogeny the maximum whorl breadth migrates from near the umbilical edge to near the dorsal ...
Page 399
... narrow triangle with truncated apex and weakly convex flanks . Umbilicus is rather narrow , deep , funnel - like with steep walls and a sharp edge . Ornament is represented by compressed , weakly s - shaped , curved ribs , umbilical and ...
... narrow triangle with truncated apex and weakly convex flanks . Umbilicus is rather narrow , deep , funnel - like with steep walls and a sharp edge . Ornament is represented by compressed , weakly s - shaped , curved ribs , umbilical and ...
Page 401
... narrow , funnel - shaped umbilicus and tapering to the centre , smooth , narrow , concave on the shells , and ventral side , along the middle of which a low ridge is discernible . The flanks are slightly convex near the middle ...
... narrow , funnel - shaped umbilicus and tapering to the centre , smooth , narrow , concave on the shells , and ventral side , along the middle of which a low ridge is discernible . The flanks are slightly convex near the middle ...
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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