Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 278
... phragmocone stage ( Figs 11 , 23C - D ) . Here the form is at what may be termed as the ' umkwelanense ' stage , with very compressed whorls with maximum breadth at the umbilical shoulder . The flanks are smooth , save for fine ...
... phragmocone stage ( Figs 11 , 23C - D ) . Here the form is at what may be termed as the ' umkwelanense ' stage , with very compressed whorls with maximum breadth at the umbilical shoulder . The flanks are smooth , save for fine ...
Page 292
... phragmocone remains smooth . Weak , poorly developed umbilical tubercles only start appearing on the late adult phragmocone or on the adult body chamber . Again , there is considerable variation in the whorl section , as in type 1. NMB ...
... phragmocone remains smooth . Weak , poorly developed umbilical tubercles only start appearing on the late adult phragmocone or on the adult body chamber . Again , there is considerable variation in the whorl section , as in type 1. NMB ...
Page 381
... phragmocone , and finally slightly rounded on the body chamber . At first glance the species appears completely devoid of lateral ornament , save fine , prorsiradiate flexuous striae . However , closer examination under oblique ...
... phragmocone , and finally slightly rounded on the body chamber . At first glance the species appears completely devoid of lateral ornament , save fine , prorsiradiate flexuous striae . However , closer examination under oblique ...
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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