Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 6
... Neocomian species such as Trigonia vertistriata Skwarko and T. marumbiana Skwarko , via the late Cretaceous T. miriana Skwarko . The writer is unaware of any Senonian Trigonia s.s. and the long time gap between the last appearance of ...
... Neocomian species such as Trigonia vertistriata Skwarko and T. marumbiana Skwarko , via the late Cretaceous T. miriana Skwarko . The writer is unaware of any Senonian Trigonia s.s. and the long time gap between the last appearance of ...
Page 15
... of the area ; flank costae generally weakly curved , uninterrupted , and coarsely nodate . Age : Tithonian - Neocomian . Steinmanella holubi ( Kitchin , 1908 ) Trigonia sp . LOWER CRETACEOUS TRIGONIOIDA FROM THE ALGOA BASIN 15.
... of the area ; flank costae generally weakly curved , uninterrupted , and coarsely nodate . Age : Tithonian - Neocomian . Steinmanella holubi ( Kitchin , 1908 ) Trigonia sp . LOWER CRETACEOUS TRIGONIOIDA FROM THE ALGOA BASIN 15.
Page 27
... Neocomian rocks of the east coast of Africa . However , its close morphological resemblance to Anditrigonia Levy , 1967b , many species of which have been included ( Nakano 1965 ) in Megatrigonia , leaves no doubt as to its ancestry ...
... Neocomian rocks of the east coast of Africa . However , its close morphological resemblance to Anditrigonia Levy , 1967b , many species of which have been included ( Nakano 1965 ) in Megatrigonia , leaves no doubt as to its ancestry ...
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Common terms and phrases
Algoa Basin Anditrigonia antecarinal sulcus anterior commissure anterolateral shoulder anteroventrally Apiotrigoniinae Bivalvia broad chevrons coarse commissure comprises convex Cooper Cretaceous Description Shell Diagnosis elongate escutcheon carina faunas finely crenulated flank costae flank ornament genus growth rugae growth striae Hauterivian Hoepen holotype inflated anteriorly interspaces Iotrigonia irregular Kobayashi kraussi Kitchin lanceolate large maximum length Lateral view lectotype left valve longitudinal groove Megatrigoniacea moderately Myophorella Myophoriidae Nakano neotype nepionic stages Neumayr nodate Nototrigoniinae opisthogyrous beaks Paranditrigonia paratypes persisting to maturity phyletic Port Elizabeth Museum posterior set posterodorsal margin Poulton Pterotrigonia radial costellae radial ornament Rennie respiratory margin Reyes ribs right valve rostrate shallowly concave shell length Skwarko smooth South African Museum Steinmanella herzogi Goldfuss straight strongly oblique subconcentric subfamily Sundays River Superfamily synonymy Tashiro Tithonian transverse costellae transverse ornament Trigonia Trigoniacea Trigoniinae trigonioid tubercles Type species Upper Valanginian V-shaped Valanginian vau Sharpe ventral margin ventricosa Krauss Yaadia