Annals of the South African Museum |
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Page 6
Discussion As restricted here , the family Trigoniidae comprises only the nominate subfamily and the Pleurotrigoniinae van Hoepen , 1929 , in which the very narrow escutcheon is unornamented , the marginal carina becomes obsolete in ...
Discussion As restricted here , the family Trigoniidae comprises only the nominate subfamily and the Pleurotrigoniinae van Hoepen , 1929 , in which the very narrow escutcheon is unornamented , the marginal carina becomes obsolete in ...
Page 25
Character states : 1 = escutcheon carina obsolete or restricted to nepionic stages , marginal carina often restricted to umbonal region , anteriorly produced so that umbones are generally not subterminal , area relatively narrow with ...
Character states : 1 = escutcheon carina obsolete or restricted to nepionic stages , marginal carina often restricted to umbonal region , anteriorly produced so that umbones are generally not subterminal , area relatively narrow with ...
Page 39
Carinae are restricted to the nepionic stage . The area is narrow , bipartite , with oblique costellae in the umbonal region but later smooth . The flank costae of the nepionic stages are subconcentric , with fine transverse ridges .
Carinae are restricted to the nepionic stage . The area is narrow , bipartite , with oblique costellae in the umbonal region but later smooth . The flank costae of the nepionic stages are subconcentric , with fine transverse ridges .
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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 |