Annals of the South African Museum, Volume 83The Museum, 1981 - Natual history |
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Page 174
... forms within the same stratum . Whereas the large forms have simple peristomes , the persitomes of the small forms frequently have various types of apertural adornment , e.g. lateral lappets , ventral rostra , ventral horns , etc ...
... forms within the same stratum . Whereas the large forms have simple peristomes , the persitomes of the small forms frequently have various types of apertural adornment , e.g. lateral lappets , ventral rostra , ventral horns , etc ...
Page 181
... forms ( macroconchs ) whose last whorls and particularly the last body chamber are identical , while their young forms differ in section or in character of ornamentation . These differences , being not very striking , are not taken into ...
... forms ( macroconchs ) whose last whorls and particularly the last body chamber are identical , while their young forms differ in section or in character of ornamentation . These differences , being not very striking , are not taken into ...
Page 182
... forms which thus do not constitute a true species but are merely homoeomorphous local variants of the common root - stock ' ( Spath 1930 : 34 ) . This convergence is very evident in the macroconch forms of the Uitenhage olcostephanid ...
... forms which thus do not constitute a true species but are merely homoeomorphous local variants of the common root - stock ' ( Spath 1930 : 34 ) . This convergence is very evident in the macroconch forms of the Uitenhage olcostephanid ...
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Common terms and phrases
abbreviations adoral portion Africa Ammonites Amphipoda Astieria atherstoni Sharpe Barnard Baumberger Besairie bicuspidata bifurcate Bochianites body chamber Böse Broom Cantu Chapa Cape Province Cape Town carapace Cistecephalus Collignon compressed Coxa Crustacea d'Orbigny Decapoda densicostatus dentary diameter Dicynodon Diictodon dimorphism distal Distoloceras dorsal fauna figured final whorl forms genera genus growth stages Hauterivian holotype Imlay inflated inner whorls intercalated ribs Kingoria lateral views lectotype macroconch male margin material Maxilla Maxilliped Olcostephanus Olcostephanus Oudenodon outer whorl parabolae Paramelita paratypes Peponocephala Pereopod peristome posterior primary ribs prominent prorsiradiate secondaries ribs between bundles Riccardi Rogersites rursiradiate primaries secondary ribs segment setae slightly South African Museum Spath species spines Subastieria Sundays River Sundays River Formation synonym Taraises Formation terminate Thieuloy Type specimen Type specimen Skull Uitenhage umbilical bullae umbilical seam umbilical shoulder umbilical tubercles umbilical walls umbilicus Upper Valanginian uropod Valanginian Vema venter Ventral and lateral ventral views whorl section