Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 243
... diameter ; Wb WH = whorl height ; U = umbilical diameter . Ut , Lt and Vt respectively refer to the number of umbilical , lateral and ventral tubercles . Figures in parentheses are dimensions as a percentage of the total diameter ...
... diameter ; Wb WH = whorl height ; U = umbilical diameter . Ut , Lt and Vt respectively refer to the number of umbilical , lateral and ventral tubercles . Figures in parentheses are dimensions as a percentage of the total diameter ...
Page 253
... diameter increases , and the umbilical edge becomes rounded towards and on the body chamber . In some forms with ... diameters , whereas macroconchs retain the smooth or weakly ornamented stage to much greater diameters and are generally ...
... diameter increases , and the umbilical edge becomes rounded towards and on the body chamber . In some forms with ... diameters , whereas macroconchs retain the smooth or weakly ornamented stage to much greater diameters and are generally ...
Page 304
UMBILICAL DIAMETER ( mm ) C 5 11 10 35- 30- 25- 15- 10- 5 . 50 100 150 200 DIAMETER ( mm ) Fig . 51. Placenticeras kaffrarium Etheridge , 1904. Size distribution . 250 270 50 100 150 TOTAL DIAMETER ( mm ) 200 250 Fig . 52. Placenticeras ...
UMBILICAL DIAMETER ( mm ) C 5 11 10 35- 30- 25- 15- 10- 5 . 50 100 150 200 DIAMETER ( mm ) Fig . 51. Placenticeras kaffrarium Etheridge , 1904. Size distribution . 250 270 50 100 150 TOTAL DIAMETER ( mm ) 200 250 Fig . 52. Placenticeras ...
Contents
List of species referred to Placenticeratidae | 384 |
Acknowledgements | 391 |
241 | 393 |
Copyright | |
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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