Annals of the South African Museum |
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Page 9
The ventral margin is broadly convex and the moderately short respiratory margin obliquely truncate . The escutcheon is lanceolate , slightly more than half the shell length , and is ornamented with radial rows of fine tubercles that ...
The ventral margin is broadly convex and the moderately short respiratory margin obliquely truncate . The escutcheon is lanceolate , slightly more than half the shell length , and is ornamented with radial rows of fine tubercles that ...
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
The posterodorsal margin is deeply concave and the narrow respiratory margin rounded . The escutcheon is broad , deeply sunken , lanceolate , with weak oblique costellae along its outer margin , the inner margin being smooth .
The posterodorsal margin is deeply concave and the narrow respiratory margin rounded . The escutcheon is broad , deeply sunken , lanceolate , with weak oblique costellae along its outer margin , the inner margin being smooth .
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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 |