Annals of the South African Museum |
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Page 9
The valves are moderately weakly inflated ( W / H = 0,28-0,33 ) , with an almost straight posterodorsal margin at right angles to the broadly convex anterior margin . The ventral margin is broadly convex and the moderately short ...
The valves are moderately weakly inflated ( W / H = 0,28-0,33 ) , with an almost straight posterodorsal margin at right angles to the broadly convex anterior margin . The ventral margin is broadly convex and the moderately short ...
Page 33
The straight , subvertical anterior margin passes evenly into the almost straight ventral margin . The posterodorsal margin is broadly concave and the respiratory margin seems to have been narrowly rounded .
The straight , subvertical anterior margin passes evenly into the almost straight ventral margin . The posterodorsal margin is broadly concave and the respiratory margin seems to have been narrowly rounded .
Page 39
Anterior margin weakly curved to almost straight , very high , with broad , flattish anterior face , passing rather sharply into the broad , straight to slightly concave ventral margin . The posterodorsal margin is deeply concave and ...
Anterior margin weakly curved to almost straight , very high , with broad , flattish anterior face , passing rather sharply into the broad , straight to slightly concave ventral margin . The posterodorsal margin is deeply concave and ...
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Common terms and phrases
angles anterior anteroventrally appearance beaks become broad coarse 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 groove growth rugae Hoepen holotype holubi Kitchin included inflated anteriorly interspaces Iotrigonia irregular Kitchin Kobayashi Lateral view left valve length longitudinal marginal carina material maturity maximum meet Megatrigonia moderately Myophorella Nakano narrow Neocomian nepionic stages nodate nodes Note oblique obsolete Occurrence opisthogyrous original ornament persists Port Elizabeth Museum posterior posteriorly primitive Pringle produced prominent Pterotrigonia radial references region 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 Trigonia Trigoniinae tubercles Type umbones Upper V-shaped 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 |