Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 250
... stages . After the juvenile stage , which , naturally , is present in all species , the shell may pass through all three successive stages to maturity . In others , however , the smooth , early phragmocone stage is retained to maturity ...
... stages . After the juvenile stage , which , naturally , is present in all species , the shell may pass through all three successive stages to maturity . In others , however , the smooth , early phragmocone stage is retained to maturity ...
Page 278
... stages . ( a ) Embryonic stage . This includes the very early stage with the protoconch and subsequent early whorls . This can be seen in NMB D941 / 7 ( Fig . 23E - F ) , NMB D1150 ( Fig . 24 ) , SAS Z680 , SAM - PCZ6190 ( Fig . 23C - D ) ...
... stages . ( a ) Embryonic stage . This includes the very early stage with the protoconch and subsequent early whorls . This can be seen in NMB D941 / 7 ( Fig . 23E - F ) , NMB D1150 ( Fig . 24 ) , SAS Z680 , SAM - PCZ6190 ( Fig . 23C - D ) ...
Page 357
... stage has never been found in Hoplitoplacenticeras . Also , as far as we know , fine , thread - like ribbing has ... stage ( Fig . 110 ) . They are ammonitic throughout . In the juvenile stage the lateral lobe ( L ) is distinctly trifid ...
... stage has never been found in Hoplitoplacenticeras . Also , as far as we know , fine , thread - like ribbing has ... stage ( Fig . 110 ) . They are ammonitic throughout . In the juvenile stage the lateral lobe ( L ) is distinctly trifid ...
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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