Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 292
3 A B Fig . 39. Placenticeras kaffrarium Etheridge , 1904. Whorl section of different specimens to illustrate variation . A. NMB D1150 , ' kaffrarium ' type . B. NMB D1150 , ' sub - kaffrarium ' type . C. NMB D1343 , ' umkwelanense ...
3 A B Fig . 39. Placenticeras kaffrarium Etheridge , 1904. Whorl section of different specimens to illustrate variation . A. NMB D1150 , ' kaffrarium ' type . B. NMB D1150 , ' sub - kaffrarium ' type . C. NMB D1343 , ' umkwelanense ...
Page 306
... whorl section is strongly subtrigonal with maximum whorl breadth at the site of the umbilical tubercle , but breadth to height ratios vary widely . This is the typical ' subkaffrarium ' type of sculpture where umbilical ornament is ...
... whorl section is strongly subtrigonal with maximum whorl breadth at the site of the umbilical tubercle , but breadth to height ratios vary widely . This is the typical ' subkaffrarium ' type of sculpture where umbilical ornament is ...
Page 344
... whorl section . A number of specimens from the same restricted strati- graphic level ( Figs 86-88 ) show the total spectrum of intraspecific variation in this character - ranging from a compressed , flat - sided whorl section to an ...
... whorl section . A number of specimens from the same restricted strati- graphic level ( Figs 86-88 ) show the total spectrum of intraspecific variation in this character - ranging from a compressed , flat - sided whorl section to an ...
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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