Annals of the South African Museum, Volume 83The Museum, 1981 - Natual history |
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Page 231
... stage than that represented by the holotype of O. modderensis . Another gigantic phragmocone ( Fig . 71A - C ) , approximately 220 mm in diameter , shows an even later growth stage in the ontogeny of this species . The secondary ribbing ...
... stage than that represented by the holotype of O. modderensis . Another gigantic phragmocone ( Fig . 71A - C ) , approximately 220 mm in diameter , shows an even later growth stage in the ontogeny of this species . The secondary ribbing ...
Page 267
... stage , the macro- conch is , therefore , slightly more densely ribbed than the microconch . After about 60 mm diameter the whorl section rapidly becomes extremely inflated , reaching a maximum about one - third of a whorl behind the ...
... stage , the macro- conch is , therefore , slightly more densely ribbed than the microconch . After about 60 mm diameter the whorl section rapidly becomes extremely inflated , reaching a maximum about one - third of a whorl behind the ...
Page 296
... stage it seems unlikely that this variety can be distinguished from O. baini baini ( 4 ) . Measurements No. D H Wi W ... stages suggests that the differences are of no more than varietal importance . A single example , from the Sundays ...
... stage it seems unlikely that this variety can be distinguished from O. baini baini ( 4 ) . Measurements No. D H Wi W ... stages suggests that the differences are of no more than varietal importance . A single example , from the Sundays ...
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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