Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 278
... section at a diameter of about 2 mm . Thereafter , the whorls soon become compressed , as in typical large ... whorl section becomes more inflated and rounded , the umbilical shoulder also becomes more rounded , umbilical tubercles of ...
... section at a diameter of about 2 mm . Thereafter , the whorls soon become compressed , as in typical large ... whorl section becomes more inflated and rounded , the umbilical shoulder also becomes more rounded , umbilical tubercles of ...
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 ...
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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