Annals of the South African Museum, Volume 73The Museum, 1977 - Natual history |
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Page 297
... becomes detached . The initial whorl section is suboctagonal , slightly higher than wide , but eventually becomes subrectangular with a rounded venter and a slight dorsal zone of impression ( Fig . 6B ) . = At the smallest preserved ...
... becomes detached . The initial whorl section is suboctagonal , slightly higher than wide , but eventually becomes subrectangular with a rounded venter and a slight dorsal zone of impression ( Fig . 6B ) . = At the smallest preserved ...
Page 318
... becomes laterally compressed as size increases . Ornamentation is best shown by the holotype . At the smallest ... become increasingly differentiated over the venter . Initially this appears as a mere flattening along the siphonal line ...
... becomes laterally compressed as size increases . Ornamentation is best shown by the holotype . At the smallest ... become increasingly differentiated over the venter . Initially this appears as a mere flattening along the siphonal line ...
Page 334
... becomes finer and wider - spaced and somewhat rursiradiate . Ribbing over the dorsum is very weak at this stage . Occasional bifurcations occur at the umbilical edge . On the body chamber the whorl section becomes dome - shaped with a ...
... becomes finer and wider - spaced and somewhat rursiradiate . Ribbing over the dorsum is very weak at this stage . Occasional bifurcations occur at the umbilical edge . On the body chamber the whorl section becomes dome - shaped with a ...
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Common terms and phrases
abbreviations adcauline adnate Albian Allman Ammonites Ammonoidea Amphipoda Ancyloceras Adouliceras ancyloceratid aperture Aptian Aptian III-IV Australiceras author's name authors Barremian bicuspidata BMNH body chamber cala Campanian Cape Town capensis Casey Cenomanian coiling Collignon constrictions Cretaceous Crioceras crozier described Description distal dorsal dorsum Eoxenopoides reuningi fauna figures flanks fossil Gastropoda genus gonothecae Haughton Helicancyloceras Nonyaniceras Hoepen holotype hydrocladia hydrothecae inner whorls internode Kerguelen Kossmat lateral Lectotype length lobe locality 168 locality 170 Lower Aptian Maastrichtian Madagascar material metres Millard Mozambique mozambiquense nematothecae occur ornament paratypes Pedicel phragmocone pipids Pseudophyllites referred ribs rounded Saghalinites Santonian scientific name segment separated Sertularella seta shaft shoulder Sinzow South African Museum southern Spath species specimen spines Stechow stem subheadings subsimbirskense SUID-AFRIKAANSE MUSEUM suture line Symplectoscyphus Synonymy Tetragonites text-fig Tonohamites Totton Toxoceratoides Tropaeum tubercles umbilical Umzamba Upper Aptian venter ventral Vervoort Wb/Wh whorl section Wiedmann Xenopus Zululand