Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 12
... smooth ; area relatively broad , with or without nodes demar- cating the longitudinal furrow ; marginal carina persisting to maturity ; flank costae evenly curved , nodes predominating , without greatly enlarged nodes or intercalatories ...
... smooth ; area relatively broad , with or without nodes demar- cating the longitudinal furrow ; marginal carina persisting to maturity ; flank costae evenly curved , nodes predominating , without greatly enlarged nodes or intercalatories ...
Page 25
... smooth or with transverse costellae ; area smooth or with transverse or radial costellae ; flank costae V - shaped or oblique , weakly nodate , entire or tuberculate . Discussion As interpreted here , the family comprises the nominate ...
... smooth or with transverse costellae ; area smooth or with transverse or radial costellae ; flank costae V - shaped or oblique , weakly nodate , entire or tuberculate . Discussion As interpreted here , the family comprises the nominate ...
Page 43
... smooth ; carinae generally restricted to nepionic stage ; area narrow , bipartite , smooth except in earliest growth stages ; flanks with generally fine sub- concentric costae anteriorly meeting fewer , broader , subvertical posterior ...
... smooth ; carinae generally restricted to nepionic stage ; area narrow , bipartite , smooth except in earliest growth stages ; flanks with generally fine sub- concentric costae anteriorly meeting fewer , broader , subvertical posterior ...
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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