Annals of the South African Museum, Volume 83The Museum, 1981 - Natual history |
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Page 192
... bundles of 3-4 secondaries , with 1-2 intercalatories between bundles . There are 40-50 secondary ribs per half whorl . Parabolae absent at all growth stages . Peristome simple . Description Microconch ( 5 ) : the shell is rather small ...
... bundles of 3-4 secondaries , with 1-2 intercalatories between bundles . There are 40-50 secondary ribs per half whorl . Parabolae absent at all growth stages . Peristome simple . Description Microconch ( 5 ) : the shell is rather small ...
Page 193
... bundles of usually 4 fine secondary ribs , rarely 3 or 5 , with commonly 2 intercalated ribs between bundles , although there may occasionally be one only . Thus , on the adoral portion of the outer whorl there are 37 secondaries per 7 ...
... bundles of usually 4 fine secondary ribs , rarely 3 or 5 , with commonly 2 intercalated ribs between bundles , although there may occasionally be one only . Thus , on the adoral portion of the outer whorl there are 37 secondaries per 7 ...
Page 207
... bundles . On the adoral three - quarters of the outer whorl , the adapical rib of most bundles bifurcates . Its strongly compressed form separates Imlay's ( 1938 ) species from O. atherstoni . Olcostephanus irregularis ( Wegner ) ( Fig ...
... bundles . On the adoral three - quarters of the outer whorl , the adapical rib of most bundles bifurcates . Its strongly compressed form separates Imlay's ( 1938 ) species from O. atherstoni . Olcostephanus irregularis ( Wegner ) ( Fig ...
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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