Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 12
... curved , nodes predominating , without greatly enlarged nodes or intercalatories anteriorly . Discussion Within Myophorella it is possible to recognize several subgenera : M. ( Myophorella ) —escutcheon smooth ; flank costae distinctly ...
... curved , nodes predominating , without greatly enlarged nodes or intercalatories anteriorly . Discussion Within Myophorella it is possible to recognize several subgenera : M. ( Myophorella ) —escutcheon smooth ; flank costae distinctly ...
Page 15
... 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.
... 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 24
... curved anterior margins form an acute angle , with terminal umbones and weakly inturned , orthogyrous to slightly opisthogyrous beaks . The ventral margin is very long , weakly convex , and the broad respiratory margin subtruncate . The ...
... curved anterior margins form an acute angle , with terminal umbones and weakly inturned , orthogyrous to slightly opisthogyrous beaks . The ventral margin is very long , weakly convex , and the broad respiratory margin subtruncate . The ...
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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