Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 292
... adult phragmocone or on the adult body chamber . Again , there is considerable variation in the whorl section , as in type 1. NMB D941 / 33 ( macroconch ) ( Fig . 47 ) and SAS Z1065c ( microconch ) ( Fig . 48 ) are good examples ( also ...
... adult phragmocone or on the adult body chamber . Again , there is considerable variation in the whorl section , as in type 1. NMB D941 / 33 ( macroconch ) ( Fig . 47 ) and SAS Z1065c ( microconch ) ( Fig . 48 ) are good examples ( also ...
Page 357
... adult stage - the position of the clavi changing from alternating to only slightly offset . Another apparent differ- ence seems to be that a smooth Placenticeras juvenile stage has never been found in Hoplitoplacenticeras . Also , as ...
... adult stage - the position of the clavi changing from alternating to only slightly offset . Another apparent differ- ence seems to be that a smooth Placenticeras juvenile stage has never been found in Hoplitoplacenticeras . Also , as ...
Page 450
... adult valves varies between 20 and 70 per cent , with the higher values concentrated in water depths between 200 m and 250 m in the Orange Shelf area ( Figs 8 , 9 ) . These assemblages of mixed adults and juveniles suggest that both the ...
... adult valves varies between 20 and 70 per cent , with the higher values concentrated in water depths between 200 m and 250 m in the Orange Shelf area ( Figs 8 , 9 ) . These assemblages of mixed adults and juveniles suggest that both the ...
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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