Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 264
... Parengonoceras and Hypengonoceras is by means of sutural ontogeny . Unequivocal adventive lobes occur in Parengonoceras ( Fig . 18 ) , which clearly places the genus in the family Engonoceratidae . As yet , the sutural ontogeny of ...
... Parengonoceras and Hypengonoceras is by means of sutural ontogeny . Unequivocal adventive lobes occur in Parengonoceras ( Fig . 18 ) , which clearly places the genus in the family Engonoceratidae . As yet , the sutural ontogeny of ...
Page 364
... Parengonoceras . Freely translated Renz stated that ' The suture lines seem to be of significant importance in distinguishing between Parengonoceras and Hypengonoceras . Reference is made to two illustrations of external sutures : the ...
... Parengonoceras . Freely translated Renz stated that ' The suture lines seem to be of significant importance in distinguishing between Parengonoceras and Hypengonoceras . Reference is made to two illustrations of external sutures : the ...
Page 365
... Parengonoceras and Hypen- gonoceras , there was never any doubt about the systematic placing of the former genus . Again we suspect that this systematic grouping had been influenced more by stratigraphy than natural affinities . Being ...
... Parengonoceras and Hypen- gonoceras , there was never any doubt about the systematic placing of the former genus . Again we suspect that this systematic grouping had been influenced more by stratigraphy than natural affinities . Being ...
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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