Annals of the South African Museum |
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Page 4
The most primitive trigoniaceans are assigned to the family Gruenewaldiidae nov . , in which the hinge is myophorian , with only partially striated teeth , and the areal ornament is predominantly transverse ( Newell & Boyd 1975 ) .
The most primitive trigoniaceans are assigned to the family Gruenewaldiidae nov . , in which the hinge is myophorian , with only partially striated teeth , and the areal ornament is predominantly transverse ( Newell & Boyd 1975 ) .
Page 26
Since treatment of Paranditrigonia as a subgenus of Anditrigonia emphasizes primitive characters , when it is the derived characters ( radial ornament to the area ) that are phyletically important , Paranditrigonia is elevated to ...
Since treatment of Paranditrigonia as a subgenus of Anditrigonia emphasizes primitive characters , when it is the derived characters ( radial ornament to the area ) that are phyletically important , Paranditrigonia is elevated to ...
Page 43
Although this taxon is included by many within the synonymy of the Megatrigoniinae , the subfamily is present already in the Upper Bajocian of Argentina , contemporaneous with the most primitive megatrigoniines , i.e. Anditrigonia ...
Although this taxon is included by many within the synonymy of the Megatrigoniinae , the subfamily is present already in the Upper Bajocian of Argentina , contemporaneous with the most primitive megatrigoniines , i.e. Anditrigonia ...
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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 |