Annals of the South African Museum |
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Page 15
Simply by failure to produce coarse irregular growth rugae across the mature area , Steinmanella gave rise to Yaadia , a predominantly North Pacific genus ( Saul 1979 ) . The latter lineage persisted into the Upper Cretaceous with the ...
Simply by failure to produce coarse irregular growth rugae across the mature area , Steinmanella gave rise to Yaadia , a predominantly North Pacific genus ( Saul 1979 ) . The latter lineage persisted into the Upper Cretaceous with the ...
Page 24
At lengths of 50-100 mm the tubercles of the area become elongated transversely to form coarse , irregular , growth rugae . The concentric flank costae of the nepionic stages pass on to the area , whereas the longitudinal furrow ...
At lengths of 50-100 mm the tubercles of the area become elongated transversely to form coarse , irregular , growth rugae . The concentric flank costae of the nepionic stages pass on to the area , whereas the longitudinal furrow ...
Page 39
The anterior costae are as wide as or narrower than the interspaces ; those closest to the umbo are coarsely tuberculate throughout . Posteriorly , however , the coarse rounded tuberculation is increasingly restricted to the ventral ...
The anterior costae are as wide as or narrower than the interspaces ; those closest to the umbo are coarsely tuberculate throughout . Posteriorly , however , the coarse rounded tuberculation is increasingly restricted to the ventral ...
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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 |