Annals of the South African Museum, Volume 80The Museum, 1980 - Natural history |
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Page 26
... external tubercles on the venter of part of the phragmocone . x 1 . Beyond this trituberculate stage ornament in the material varies con- siderably . The ventrolateral tubercles tend to become lower and broader , and in some of the ...
... external tubercles on the venter of part of the phragmocone . x 1 . Beyond this trituberculate stage ornament in the material varies con- siderably . The ventrolateral tubercles tend to become lower and broader , and in some of the ...
Page 100
... tubercles are no longer spinose , but appear as prominent rounded bosses , indicating that the original spines became detached at a basal septum . The external ( 5 ) tubercles are distinctly separated , though very elongated . The ...
... tubercles are no longer spinose , but appear as prominent rounded bosses , indicating that the original spines became detached at a basal septum . The external ( 5 ) tubercles are distinctly separated , though very elongated . The ...
Page 289
... external ( 5 ) tubercles . Bifurcations or intercalations occur at the submarginal ( 3 ) tubercle , but not regularly , as single ribs occur as well , resulting in a ratio of umbilical to external tubercles of slightly less than 1 : 2 ...
... external ( 5 ) tubercles . Bifurcations or intercalations occur at the submarginal ( 3 ) tubercle , but not regularly , as single ribs occur as well , resulting in a ratio of umbilical to external tubercles of slightly less than 1 : 2 ...
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