Annals of the South African Museum, Volume 83 |
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Page 176
61 whorls each , their aperture is not quite simple , but is nearing that of the growth stages of large forms and provided with ... Hence , they should be regarded as large forms whose growth halted at the stage with about 6 whorls .
61 whorls each , their aperture is not quite simple , but is nearing that of the growth stages of large forms and provided with ... Hence , they should be regarded as large forms whose growth halted at the stage with about 6 whorls .
Page 267
At this stage , the macroconch 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 ...
At this stage , the macroconch 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 ...
Page 296
There are 26 secondaries per 5 bullae at this growth stage , with 16 ribs in a 40 mm distance along the venter . Beyond this growth stage it seems unlikely that this variety can be distinguished from O. baini baini ( 2 ) .
There are 26 secondaries per 5 bullae at this growth stage , with 16 ribs in a 40 mm distance along the venter . Beyond this growth stage it seems unlikely that this variety can be distinguished from O. baini baini ( 2 ) .
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Common terms and phrases
abbreviations Africa Ammonites appears arise Astieria atherstoni Sharpe authors baini baini Sharpe Barnard Baumberger bearing become body body chamber Broom bundles close collected compressed considered described Description designated diameter Dicynodon differs Diictodon dimorphism distinguished dorsal example Family fauna Feresa figured Formation forms front genus give holotype illustrations Imlay included inflated inner whorls intercalated ribs Kitchin known lacking lateral views length Locality lower macroconch male margin material narrow Neocomian Note Olcostephanus Olcostephanus original outer whorl parabolae Pereopod peristome portion posterior present primaries prominent recorded references represent Rogersites rostrum rounded rursiradiate secondary ribs segment separates Sharpe short shows similar single Skull slightly Smith South African Museum Spath species spines stage strongly Sundays River tables terminate tubercles Type specimen umbilical bullae umbilical shoulder umbilicus Upper Valanginian Vema venter ventral whorl section Zone
Bibliographic information
| Title | Annals of the South African Museum, Volume 83 Annals of the South African Museum, South African Museum Volume 83 of Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum, South African Museum |
| Author | South African Museum |
| Publisher | The Museum, 1981 |
| Original from | the University of California |
| Digitized | 9 Dec 2009 |
| ISBN | 0868130060, 9780868130064 |
| Export Citation | BiBTeX EndNote RefMan |