Annals of the South African Museum |
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Page 25
... finely crenulated and often crowded costellae , inner margin of shell crenulated posteroventrally ; = escutcheon ... from finely crenulated to spinose , respiratory margin generally rounded , escutcheon with transverse costellae .
... finely crenulated and often crowded costellae , inner margin of shell crenulated posteroventrally ; = escutcheon ... from finely crenulated to spinose , respiratory margin generally rounded , escutcheon with transverse costellae .
Page 33
The ten or so costae of the posterior set of ribs are finely crenulated , subparallel , narrower than the interspaces , and meet the posteroventral margin at right angles . Occurrence Pterotrigonia ( ? Pterotrigonia ) knighti ( Pringle ) ...
The ten or so costae of the posterior set of ribs are finely crenulated , subparallel , narrower than the interspaces , and meet the posteroventral margin at right angles . Occurrence Pterotrigonia ( ? Pterotrigonia ) knighti ( Pringle ) ...
Page 39
Posteriorly , however , the coarse rounded tuberculation is increasingly restricted to the ventral part of the costa , leaving the dorsal extension as a thin , wavy , vertical , finely crenulated costella .
Posteriorly , however , the coarse rounded tuberculation is increasingly restricted to the ventral part of the costa , leaving the dorsal extension as a thin , wavy , vertical , finely crenulated costella .
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Common terms and phrases
angles anterior anteroventrally appearance beaks become broad coarse commissure comprises concave concentric conocardiiformis Krauss convex Cooper crenulated Cretaceous crowded curved Description designation Diagnosis differs Discussion dorsal elongate escutcheon face faunas figured fine finely flank costae follow Formation genus Goldfuss growth rugae herzogi Hoepen holotype holubi Kitchin included interspaces Iotrigonia irregular Kitchin Kobayashi lanceolate Lateral view left valve marginal carina material maturity meet Megatrigonia moderately Myophorella Nakano narrow Neocomian nepionic stages nodate nodes Note oblique obsolete Occurrence opisthogyrous original ornament persists Pisotrigonia Port Elizabeth Museum posterior posteriorly primitive Pringle produced prominent Pterotrigonia radial references region relatively respiratory margin restricted Reyes ribs rounded rows separates Sharpe shell shoulder similar Skwarko slightly smooth South African Museum species specimens Steinmanella straight strongly subconcentric subfamily Superfamily Tashiro transverse transverse costellae trigonally Trigonia Trigoniinae tubercles Type umbones Upper Valanginian valve ventral margin weakly
Bibliographic information
| Title | Annals of the South African Museum Annals of the South African Museum, South African Museum Volume 100 of Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum, South African Museum |
| Author | South African Museum |
| Publisher | The Museum, 1991 |
| Original from | the University of California |
| Digitized | 21 Jul 2016 |
| ISBN | 0868131180, 9780868131184 |
| Export Citation | BiBTeX EndNote RefMan |