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 ...
Contents
List of species referred to Placenticeratidae | 384 |
Acknowledgements | 391 |
241 | 393 |
Copyright | |
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Common terms and phrases
9 figs adult adventive lobe Albian ammonite Anaplacenticeras body chamber Campanian of Germany Cenomanian Cenomanian of Central Cenomanian-Turonian of India Central Asia Chiplonkar & Ghare Cobban Collignon 1965a compressed Coniacian diameter dimorphism Engonoceratidae flanks forms fritschi de Grossouvre genus Gissarites Grossouvre Hengestites holotype Hoplitidae Hoplitoplacenticeras Hypengonoceras decaryi Collignon Iljin incision India Chiplonkar intraspecific variation Karamaites Kennedy & Wright Klinger Knemiceras Kopetdagites Kossmat lateral lobe lateral ornament lateral tubercles lectotype Luppov Maastrichtian Macroconch Madagascar Metaplacenticeras Michailova Microconch with type ontogenetic ontogenetic changes ontogenetic stage Parengonoceras Paulcke phragmocone Placenticeras fritschi Placenticeras kaffrarium Etheridge Placenticeras polyopsis Dujardin Placenticeras syrtale Morton Placenticeratidae Proplacenticeras Reeside ribs rounded Ruzhentsev Santonian Santonian of France scaphitoid uncoiling Schlüter shell Spath Stantonoceras subkaffrarium sutural ontogeny suture line text-fig ticeras Turonian type 4 ornament Type species umbilical edge umbilical tubercles umbilical wall umbilicus Upper Albian Upper Campanian Upper Cretaceous ventral clavi whorl section Wiedmann Zululand