Annals of the South African Museum |
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Page 9
The trigonal area is relatively narrow and almost flat . ... The flanks are ornamented with up to 28 pronounced , subconcentric costae that are slightly narrower than the interspaces on the posterior half of the shell .
The trigonal area is relatively narrow and almost flat . ... The flanks are ornamented with up to 28 pronounced , subconcentric costae that are slightly narrower than the interspaces on the posterior half of the shell .
Page 24
The escutcheon is fairly narrow , and about two - thirds the length of the shell . It is ornamented by irregular oblique rows of elongate tubercles that vary in size and follow the growth striae . Posteriorly these tubercles are ...
The escutcheon is fairly narrow , and about two - thirds the length of the shell . It is ornamented by irregular oblique rows of elongate tubercles that vary in size and follow the growth striae . Posteriorly these tubercles are ...
Page 29
There is a very narrow but rather deep lunule that extends about one - third of the shell height . An escutcheon carina is lacking whereas , beyond about 8 mm from the umbo , the marginal carina passes into a rounded umbonal ridge .
There is a very narrow but rather deep lunule that extends about one - third of the shell height . An escutcheon carina is lacking whereas , beyond about 8 mm from the umbo , the marginal carina passes into a rounded umbonal ridge .
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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 |