Annals of the South African Museum, Volume 73The Museum, 1977 - Natual history |
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Page 241
... ribs only , separated by wider interspaces . Average rib density is about sixteen to eighteen per dorso - ventral diameter . On the distal half to third of the shaft , stronger ribs start appearing on the flanks , bearing umbilical and ...
... ribs only , separated by wider interspaces . Average rib density is about sixteen to eighteen per dorso - ventral diameter . On the distal half to third of the shaft , stronger ribs start appearing on the flanks , bearing umbilical and ...
Page 318
... ribs , slightly prorsiradiate and separated by interspaces of similar width . At this stage there are approximately six ribs in a distance equal to the whorl diameter . At a slightly larger diameter the ribs become increasingly ...
... ribs , slightly prorsiradiate and separated by interspaces of similar width . At this stage there are approximately six ribs in a distance equal to the whorl diameter . At a slightly larger diameter the ribs become increasingly ...
Page 341
... ribs along the siphonal line , creating a ' paternoster ' effect . Discussion The distinct ventral tuberculation and ... ribs , each bearing weak ventral and lateral tubercles . On the outer whorl the ribs are stronger , prominently ...
... ribs along the siphonal line , creating a ' paternoster ' effect . Discussion The distinct ventral tuberculation and ... ribs , each bearing weak ventral and lateral tubercles . On the outer whorl the ribs are stronger , prominently ...
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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