Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 278
... rounded , the umbilical shoulder also becomes more rounded , umbilical tubercles of varying strength , c . 7-8 per whorl develop , connected by single or bifurcating ribs of varying strength to weak or prominent lateral tubercles ...
... rounded , the umbilical shoulder also becomes more rounded , umbilical tubercles of varying strength , c . 7-8 per whorl develop , connected by single or bifurcating ribs of varying strength to weak or prominent lateral tubercles ...
Page 305
... rounded and smooth , or directly from flat and smooth to rounded and smooth without an intermediate tuberculate stage . Examples are SAS Z1520g ( macro- conch ) and NMB D1269 ( macroconch , Fig . 56 ) . These three morphotypes are all ...
... rounded and smooth , or directly from flat and smooth to rounded and smooth without an intermediate tuberculate stage . Examples are SAS Z1520g ( macro- conch ) and NMB D1269 ( macroconch , Fig . 56 ) . These three morphotypes are all ...
Page 381
... rounded in the very early ( embryonic ) stages of growth , but then becomes concave and eventually flat on the greater part of the phragmocone , and finally slightly rounded on the body chamber . At first glance the species appears ...
... rounded in the very early ( embryonic ) stages of growth , but then becomes concave and eventually flat on the greater part of the phragmocone , and finally slightly rounded on the body chamber . At first glance the species appears ...
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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