Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 249
... present ) may migrate outward , in some up to midflank , and the venter becomes distinctly rounded and eventually may be completely smooth on the body chamber with no ventral clavi , if these were present initially . In addition , the ...
... present ) may migrate outward , in some up to midflank , and the venter becomes distinctly rounded and eventually may be completely smooth on the body chamber with no ventral clavi , if these were present initially . In addition , the ...
Page 292
... present collection , the last septum is formed at diameters between 110 and 120 mm , whereas macroconchs show a wider range of maximum diameter , but generally form the last septum at between 150 and 185 mm . The length of the body ...
... present collection , the last septum is formed at diameters between 110 and 120 mm , whereas macroconchs show a wider range of maximum diameter , but generally form the last septum at between 150 and 185 mm . The length of the body ...
Page 358
... present it seems advisable to retain the two genera , though fully aware of the range of overlap . Matsumoto ( 1984 : 20-21 ) recently discussed the genus Metaplacenticeras and alleged that a true adventive lobe ( A ) was present in the ...
... present it seems advisable to retain the two genera , though fully aware of the range of overlap . Matsumoto ( 1984 : 20-21 ) recently discussed the genus Metaplacenticeras and alleged that a true adventive lobe ( A ) was present in 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