Annals of the South African Museum, Volume 80The Museum, 1980 - Natural history |
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Page 12
... becomes rectangular . Traces of the submarginal ( 3 ) tubercles become visible in the umbilical seam at a diameter of about 14 mm . From then onward , ornament remains basically the same , apart from the fact that the ribs tend to become ...
... becomes rectangular . Traces of the submarginal ( 3 ) tubercles become visible in the umbilical seam at a diameter of about 14 mm . From then onward , ornament remains basically the same , apart from the fact that the ribs tend to become ...
Page 89
... becomes higher than wide with a subtrigonal whorl section and little - inflated flanks . Towards the body chamber the flanks become more inflated and the whorl section more rounded ( Fig . 72B ) . SAS - Z1790a has the inner whorls ...
... becomes higher than wide with a subtrigonal whorl section and little - inflated flanks . Towards the body chamber the flanks become more inflated and the whorl section more rounded ( Fig . 72B ) . SAS - Z1790a has the inner whorls ...
Page 92
... become thinner , and the lateral tubercles tend to become absorbed , followed by the umbilical and eventually submarginal tubercles . The keel also becomes much weakened on the body chamber . The suture is broad with squat saddles and ...
... become thinner , and the lateral tubercles tend to become absorbed , followed by the umbilical and eventually submarginal tubercles . The keel also becomes much weakened on the body chamber . The suture is broad with squat saddles and ...
Contents
THE AMMONITE SUBFAMILY TEXANITINAE COLLIGNON | 2 |
Evolution and evolutionary trends in Texanitinae | 348 |
References | 354 |
Copyright | |
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Common terms and phrases
Africa Ammonites australis Besairie besairiei Bevahites bifurcations body chamber CALIFORN Campanian of Madagascar clavate Collignon 1948 Coniacian Cretaceous ERSITY external tubercles falloti False Bay flanks Gulf Coast higher than wide Hoepen Hokkaido holotype inner whorls jeanneti Kennedy & Klinger lateral keels lateral ornament lateral tubercle lobes Lower Campanian Lower Santonian marginal material Matsumoto 1970 Menabites Australiella Menabites Delawarella Middle Campanian Mortoniceras occur ontogeny outer whorls Parabevahites Paratexanites Paratexanites pseudotricarinatum sp Paratype phragmocone Plesiotexanites stangeri Baily Pondoland radially elongated Reginaites ribs Richards Bay row of tubercles SAN DIEGO soutoni natalense ssp Spath specimen figured St Lucia Formation stage stratigraphic subdelawarensis submarginal Submortoniceras woodsi suture suture line Texanites soutoni natalense Texanites soutoni soutoni texanitids Texanitinae texanus text-fig tonian Transkei trituberculate type species umbilical diameter umbilical tubercles umbilical wall umbilical width Umkwelane Hill Umzamba Formation umzambiense undulating keel Upper Santonian vanhoepeni venter ventrolateral tubercles whorl section Zululand Zululand specimens