Annals of the South African MuseumThe Museum, 1989 - Natural history |
From inside the book
Results 1-3 of 34
Page 278
... venter becomes tuberculate with distinct alternat- ing ventral clavi . Generally , as soon as the umbilical tubercles appear , the edges of the venter become crenulate . This is the ' subkaffrarium ' stage ( Figs 26–28 ) . ( d ) Late ...
... venter becomes tuberculate with distinct alternat- ing ventral clavi . Generally , as soon as the umbilical tubercles appear , the edges of the venter become crenulate . This is the ' subkaffrarium ' stage ( Figs 26–28 ) . ( d ) Late ...
Page 350
... venter flat and entire . The umbilicus is partially occluded by matrix and encrusting ostreids but , although probably wider than in most P. kaffrarium , is nevertheless within the limits of the species . Umbilical ornament consists of ...
... venter flat and entire . The umbilicus is partially occluded by matrix and encrusting ostreids but , although probably wider than in most P. kaffrarium , is nevertheless within the limits of the species . Umbilical ornament consists of ...
Page 402
... venter is smooth and flat , or slightly convex . Umbilical and marginal tubercles are always present in adult specimens . The flanks are covered with sickle - shaped ribs . In places , bifurcation usually produces tubercles or tubercle ...
... venter is smooth and flat , or slightly convex . Umbilical and marginal tubercles are always present in adult specimens . The flanks are covered with sickle - shaped ribs . In places , bifurcation usually produces tubercles or tubercle ...
Other editions - View all
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