Annals of the South African Museum, Volume 80The Museum, 1980 - Natural history |
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Page 89
... diameter of c . 8 mm ; thereafter ventrolateral nodes start appearing in the umbilical seam , and soon broad , flat ribs appear , some with incipient looping . At a diameter of 20 mm umbilical tubercles start appearing at the dorsal ...
... diameter of c . 8 mm ; thereafter ventrolateral nodes start appearing in the umbilical seam , and soon broad , flat ribs appear , some with incipient looping . At a diameter of 20 mm umbilical tubercles start appearing at the dorsal ...
Page 99
... diameter of 40 to 46 per cent of the total diameter . The whorl section is angular in the early stages , becoming more rounded on the outer whorls . On the inner whorls , the section is subrectangular , broader than high , but with ...
... diameter of 40 to 46 per cent of the total diameter . The whorl section is angular in the early stages , becoming more rounded on the outer whorls . On the inner whorls , the section is subrectangular , broader than high , but with ...
Page 119
... diameter of c . 65 mm the ventrolateral ( 3 + 4 ) node starts showing signs of division by the formation of a clavate node ( 4 ) on the ventral side . With increasing diameter the separation becomes progressively more obvious , and ...
... diameter of c . 65 mm the ventrolateral ( 3 + 4 ) node starts showing signs of division by the formation of a clavate node ( 4 ) on the ventral side . With increasing diameter the separation becomes progressively more obvious , 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