Annals of the South African Museum, Volume 83The Museum, 1981 - Natual history |
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Page 206
... compressed whorl section ( W / H = 0,75 ) . On the outer whorl , nineteen rursiradiate primaries terminate in bullae which give rise to bundles of prorsi- radiate secondary ribs . The secondaries sometimes bifurcate on the flanks so ...
... compressed whorl section ( W / H = 0,75 ) . On the outer whorl , nineteen rursiradiate primaries terminate in bullae which give rise to bundles of prorsi- radiate secondary ribs . The secondaries sometimes bifurcate on the flanks so ...
Page 207
... compressed form separates Imlay's ( 1938 ) species from O. atherstoni . Olcostephanus irregularis ( Wegner ) ( Fig . 52 ) is a strongly compressed ( ? crushed ) , moderately evolute form with steep umbilical walls . About fifteen ...
... compressed form separates Imlay's ( 1938 ) species from O. atherstoni . Olcostephanus irregularis ( Wegner ) ( Fig . 52 ) is a strongly compressed ( ? crushed ) , moderately evolute form with steep umbilical walls . About fifteen ...
Page 256
... compressed form lacking parabolae and with flexuous secondary ribs which bifurcate just above the umbilical shoulder . This form is perhaps better assigned to the genus Homolsomites . Olcostephanus huizachensis ( Cantu Chapa ) ( Fig ...
... compressed form lacking parabolae and with flexuous secondary ribs which bifurcate just above the umbilical shoulder . This form is perhaps better assigned to the genus Homolsomites . Olcostephanus huizachensis ( Cantu Chapa ) ( 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