Annals of the South African Museum |
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Page 12
... the latter worker observed that its diagnostic characters serve . . . to distinguish these ( North American ) species from nearly all otherwise similar Middle and Late Jurassic European Myophorella species ' ( p . 27 ) .
... the latter worker observed that its diagnostic characters serve . . . to distinguish these ( North American ) species from nearly all otherwise similar Middle and Late Jurassic European Myophorella species ' ( p . 27 ) .
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 ...
Page 29
Then follow about seven similar ribs that are subvertical and only weakly curved . The posterior set of c . 18 costae are narrow , crowded , somewhat undulatory , broader than the interspaces , almost straight , and inclined ...
Then follow about seven similar ribs that are subvertical and only weakly curved . The posterior set of c . 18 costae are narrow , crowded , somewhat undulatory , broader than the interspaces , almost straight , and inclined ...
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Common terms and phrases
angles anterior anteroventrally appearance beaks become broad coarse 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 groove growth rugae Hoepen holotype holubi Kitchin included inflated anteriorly interspaces Iotrigonia irregular Kitchin Kobayashi Lateral view left valve length longitudinal marginal carina material maturity maximum meet Megatrigonia moderately Myophorella Nakano narrow Neocomian nepionic stages nodate nodes Note oblique obsolete Occurrence opisthogyrous original ornament persists Port Elizabeth Museum posterior posteriorly primitive Pringle produced prominent Pterotrigonia radial references region 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 Trigonia Trigoniinae tubercles Type umbones Upper V-shaped 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 |