Annals of the South African Museum, Volume 80The Museum, 1980 - Natural history |
From inside the book
Results 1-3 of 48
Page 12
... ribs start appearing . Microscopic examination of the ribs shows them to be ornamented by numerous radial striae . With the onset of ornament , the whorl section changes and becomes rectangular . Traces of the submarginal ( 3 ) ...
... ribs start appearing . Microscopic examination of the ribs shows them to be ornamented by numerous radial striae . With the onset of ornament , the whorl section changes and becomes rectangular . Traces of the submarginal ( 3 ) ...
Page 100
South African Museum. broad ribs numbering about 15 per whorl ( Fig . 79 ) . Occasional small , yet distinct intercalatory umbilical tubercles not associated with any ribs or ventro- lateral spines occur . Very faint lateral ( 2 ) ...
South African Museum. broad ribs numbering about 15 per whorl ( Fig . 79 ) . Occasional small , yet distinct intercalatory umbilical tubercles not associated with any ribs or ventro- lateral spines occur . Very faint lateral ( 2 ) ...
Page 160
... ribs displaying conical umbi- lical ( 1 ) and submarginal ( 3 ) tubercles on the exposed flank . At a diameter of c . 32 mm ribs still bifurcate regularly , rib density being about 11 ( bifurcating ribs ) per half whorl . The ...
... ribs displaying conical umbi- lical ( 1 ) and submarginal ( 3 ) tubercles on the exposed flank . At a diameter of c . 32 mm ribs still bifurcate regularly , rib density being about 11 ( bifurcating ribs ) per half whorl . The ...
Contents
THE AMMONITE SUBFAMILY TEXANITINAE COLLIGNON | 2 |
Evolution and evolutionary trends in Texanitinae | 348 |
References | 354 |
Copyright | |
Other editions - View all
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