Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 25
... inflated anteriorly , in some with subterminal umbones , flank costae strongly oblique varying from finely crenulated to spinose , respiratory margin generally rounded , escutcheon with transverse costellae . Family Megatrigoniidae van ...
... inflated anteriorly , in some with subterminal umbones , flank costae strongly oblique varying from finely crenulated to spinose , respiratory margin generally rounded , escutcheon with transverse costellae . Family Megatrigoniidae van ...
Page 27
South African Museum. inflated anteriorly and pyriform in outline , with a strongly convex anterior margin . Subfamily Megatrigoniinae van Hoepen , 1929 Diagnosis Shell generally large , massive , pyriform ; respiratory margin rounded ...
South African Museum. inflated anteriorly and pyriform in outline , with a strongly convex anterior margin . Subfamily Megatrigoniinae van Hoepen , 1929 Diagnosis Shell generally large , massive , pyriform ; respiratory margin rounded ...
Page 29
... anterior , with moderately inturned , slightly opisthogyrous beaks . Valves moderately inflated anteriorly ( H / W = 0,40-0,57 ) . Anterior margin strongly convex , passing imperceptibly into the broad , gently convex ventral margin ...
... anterior , with moderately inturned , slightly opisthogyrous beaks . Valves moderately inflated anteriorly ( H / W = 0,40-0,57 ) . Anterior margin strongly convex , passing imperceptibly into the broad , gently convex ventral margin ...
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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