Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 7
... Genus Trigonia Brugière , 1789 Type species . Venus sulcata Hermann , 1781 ; ICZN Opinion 327 ( 1955 ) . Diagnosis Escutcheon with radial ornament ; flank costae terminating at the antecari- nal sulcus or marginal carina . Discussion ...
... Genus Trigonia Brugière , 1789 Type species . Venus sulcata Hermann , 1781 ; ICZN Opinion 327 ( 1955 ) . Diagnosis Escutcheon with radial ornament ; flank costae terminating at the antecari- nal sulcus or marginal carina . Discussion ...
Page 11
... genus within the Myophorellinae characterized by radial costellae to the area . Scaphotrigonia Dietrich , 1933 , is a widely recognized genus within the Myophorellinae , characterized by its nearly straight flank costae , enlarged nodes ...
... genus within the Myophorellinae characterized by radial costellae to the area . Scaphotrigonia Dietrich , 1933 , is a widely recognized genus within the Myophorellinae , characterized by its nearly straight flank costae , enlarged nodes ...
Page 15
... genus in the subfamily is Steinmanella itself , which first occurs in Tithonian rocks of South America ( Leanza & Garate 1987 ) . Simply by failure to produce coarse irregular growth rugae across the mature area , Steinmanella gave rise ...
... genus in the subfamily is Steinmanella itself , which first occurs in Tithonian rocks of South America ( Leanza & Garate 1987 ) . Simply by failure to produce coarse irregular growth rugae across the mature area , Steinmanella gave rise ...
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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