Annals of the South African Museum, Volume 83The Museum, 1981 - Natual history |
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Page 173
... Compressed to inflated forms , usually with primary ribs terminating in tubercles on the umbilical shoulder , from which secondary ribs diverge in fasciculate bundles to pass uninterrupted across the venter . Parabolae may or may not be ...
... Compressed to inflated forms , usually with primary ribs terminating in tubercles on the umbilical shoulder , from which secondary ribs diverge in fasciculate bundles to pass uninterrupted across the venter . Parabolae may or may not be ...
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 RMT RMT Rogersites rursiradiate primaries secondary ribs segment setae Skull slightly South African Museum Spath species spines Subastieria SUID-AFRIKAANSE MUSEUM Sundays River Sundays River Formation synonym Taraises Formation terminate Thieuloy Type specimen Uitenhage umbilical bullae umbilical seam umbilical shoulder umbilical tubercles umbilical walls umbilicus Upper Valanginian uropod Valanginian Vema venter ventral views whorl section