Annals of the South African Museum |
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Page 9
The escutcheon is lanceolate , slightly more than half the shell length , and is ornamented with radial rows of fine tubercles that , on D1876 , curve inward to meet the commissure . The trigonal area is relatively narrow and almost ...
The escutcheon is lanceolate , slightly more than half the shell length , and is ornamented with radial rows of fine tubercles that , on D1876 , curve inward to meet the commissure . The trigonal area is relatively narrow and almost ...
Page 33
The oval , flattened anterior face meets the flanks at prominent anterolateral ... of the posterior set of ribs are finely crenulated , subparallel , narrower than the interspaces , and meet the posteroventral margin at right angles .
The oval , flattened anterior face meets the flanks at prominent anterolateral ... of the posterior set of ribs are finely crenulated , subparallel , narrower than the interspaces , and meet the posteroventral margin at right angles .
Page 37
In the nepionic stages it is ornamented by fine , oblique costellae that are more numerous than the flank costae , which they meet at the marginal carina in an anteriorly directed chevron .
In the nepionic stages it is ornamented by fine , oblique costellae that are more numerous than the flank costae , which they meet at the marginal carina in an anteriorly directed chevron .
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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 |