Annals of the South African Museum, Volume 80The Museum, 1980 - Natural history |
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Page 89
... umbilical width of 45 to 47 per cent of the total diameter , and a very shallow dorsal zone of impression . The ... wall , but very weakly . The umbilical tubercles ( 1 ) are situated high up on the umbilical wall , and tend to migrate ...
... umbilical width of 45 to 47 per cent of the total diameter , and a very shallow dorsal zone of impression . The ... wall , but very weakly . The umbilical tubercles ( 1 ) are situated high up on the umbilical wall , and tend to migrate ...
Page 99
... umbilical wall . Ontogenetic development can be seen in SAM - PCP5683 ( Fig . 79 ) . The very innermost whorls are not preserved , but at a diameter of 5 mm the whorl section is round , with slight swellings in the umbilical wall . From ...
... umbilical wall . Ontogenetic development can be seen in SAM - PCP5683 ( Fig . 79 ) . The very innermost whorls are not preserved , but at a diameter of 5 mm the whorl section is round , with slight swellings in the umbilical wall . From ...
Page 168
... umbilical wall of the succeeding whorl . On the innermost whorl preserved , these spines are impressed into the umbilical wall to such an extent that the whorl appears angular when viewed laterally . The spines arise from low , broad ...
... umbilical wall of the succeeding whorl . On the innermost whorl preserved , these spines are impressed into the umbilical wall to such an extent that the whorl appears angular when viewed laterally . The spines arise from low , broad ...
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