Annals of the South African Museum |
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Page 10
area broad , typically with transverse ornament and longitudinal groove often marked by row of nodes ; respiratory margin generally broadly truncate ; escutcheon smooth , nodate , or with transverse ornament ; flank ribs primitively ...
area broad , typically with transverse ornament and longitudinal groove often marked by row of nodes ; respiratory margin generally broadly truncate ; escutcheon smooth , nodate , or with transverse ornament ; flank ribs primitively ...
Page 12
Diagnosis Escutcheon smooth ; area relatively broad , with or without nodes demarcating the longitudinal furrow ; marginal carina persisting to maturity ; flank costae evenly curved , nodes predominating , without greatly enlarged nodes ...
Diagnosis Escutcheon smooth ; area relatively broad , with or without nodes demarcating the longitudinal furrow ; marginal carina persisting to maturity ; flank costae evenly curved , nodes predominating , without greatly enlarged nodes ...
Page 15
The longitudinal groove to the area is marked by a row of conspicuous nodes , of similar strength to those forming the marginal and escutcheon carinae , whereas the transverse growth striae of the area are replaced in maturity by coarse ...
The longitudinal groove to the area is marked by a row of conspicuous nodes , of similar strength to those forming the marginal and escutcheon carinae , whereas the transverse growth striae of the area are replaced in maturity by coarse ...
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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 |