Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 3
... nodate , area with transverse ornament , flank costae predominantly nodate , mostly oblique or V - shaped ; 4 escutcheon carina generally obsolete and marginal carina commonly restricted to umbonal region , shell often pyriform or ...
... nodate , area with transverse ornament , flank costae predominantly nodate , mostly oblique or V - shaped ; 4 escutcheon carina generally obsolete and marginal carina commonly restricted to umbonal region , shell often pyriform or ...
Page 10
... nodate flank costation , and the derived Vaugoniidae ( Vaugoniinae and Quadratotrigoniinae ) with nodate , V - shaped flank costae . The Frenguelliel- linae ( Fig . 4 ) preserve the primitive condition of subconcentric flank costae and ...
... nodate flank costation , and the derived Vaugoniidae ( Vaugoniinae and Quadratotrigoniinae ) with nodate , V - shaped flank costae . The Frenguelliel- linae ( Fig . 4 ) preserve the primitive condition of subconcentric flank costae and ...
Page 11
... nodate marginal and escutcheon carinae , smooth escutcheon and transversely ornamented area , whereas the ribs in some , e.g. Jaworskiella , show a tendency to become nodate . The Laevitrigoniinae Saveliev , 1958 , are frenguellielline ...
... nodate marginal and escutcheon carinae , smooth escutcheon and transversely ornamented area , whereas the ribs in some , e.g. Jaworskiella , show a tendency to become nodate . The Laevitrigoniinae Saveliev , 1958 , are frenguellielline ...
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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