Annals of the South African Museum |
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Page 6
The writer is unaware of any Senonian Trigonia s.s. and the long time gap between the last appearance of Trigonia ( ? Cenomanian ) and the first appearance of Eotrigonia ( Palaeocene ) makes such a phylogeny untenable .
The writer is unaware of any Senonian Trigonia s.s. and the long time gap between the last appearance of Trigonia ( ? Cenomanian ) and the first appearance of Eotrigonia ( Palaeocene ) makes such a phylogeny untenable .
Page 9
The marginal carina is marked by a prominent rib that thickens posteriorly and is crossed by growth lirae that give it a scaly corded appearance . The flanks are ornamented with up to 28 pronounced , subconcentric costae that are ...
The marginal carina is marked by a prominent rib that thickens posteriorly and is crossed by growth lirae that give it a scaly corded appearance . The flanks are ornamented with up to 28 pronounced , subconcentric costae that are ...
Page 37
In the nepionic stages , the costellae of the escutcheon extend to the median longitudinal groove of the area , giving the inner area a beaded appearance for up to 15 mm from the beak . A beaded marginal carina may extend for the same ...
In the nepionic stages , the costellae of the escutcheon extend to the median longitudinal groove of the area , giving the inner area a beaded appearance for up to 15 mm from the beak . A beaded marginal carina may extend for the same ...
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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 |