Annals of the South African MuseumThe Museum, 1991 - Natural history |
From inside the book
Results 1-3 of 14
Page 5
... radial ornament to area subordinate to transverse ornament , hinge myophorian ; 2 hinge tri- gonian , area with radial ornament , at least in nepionic stages ; 3 = shell ovate , marginal carina obsolete , beaks prosogyrous ; 4 = area ...
... radial ornament to area subordinate to transverse ornament , hinge myophorian ; 2 hinge tri- gonian , area with radial ornament , at least in nepionic stages ; 3 = shell ovate , marginal carina obsolete , beaks prosogyrous ; 4 = area ...
Page 6
... radial costellae , its broad area that is wider than the flank , and in having pustulose flank costae that terminate posteriorly in a low node at the smooth antecarinal sulcus ( Skwarko 1963 ) . These differences warrant generic ...
... radial costellae , its broad area that is wider than the flank , and in having pustulose flank costae that terminate posteriorly in a low node at the smooth antecarinal sulcus ( Skwarko 1963 ) . These differences warrant generic ...
Page 7
... radial costellae to area persisting to maturity ; marginal carina corded ; antecari- nal groove variable , often restricted to left valve . Genus Trigonia Brugière , 1789 Type species . Venus sulcata Hermann , 1781 ; ICZN Opinion 327 ...
... radial costellae to area persisting to maturity ; marginal carina corded ; antecari- nal groove variable , often restricted to left valve . Genus Trigonia Brugière , 1789 Type species . Venus sulcata Hermann , 1781 ; ICZN Opinion 327 ...
Other editions - View all
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