Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 10
... broad antecarinal sulcus shallow and unornamented , weak irregular flank costae commonly pustulose or with oblique rows of pustules . Vaugoniinae Quadratotrigoniinae prominent antecarinal sulcus , linking it to ancestral trigoniaceans ...
... broad antecarinal sulcus shallow and unornamented , weak irregular flank costae commonly pustulose or with oblique rows of pustules . Vaugoniinae Quadratotrigoniinae prominent antecarinal sulcus , linking it to ancestral trigoniaceans ...
Page 37
... broad , strongly incurved , situated about one - quarter of the shell length from the anterior , with slightly opisthogyrous beaks . Anterior margin broadly convex , flattish , passing into the very broad , gently convex ventral margin ...
... broad , strongly incurved , situated about one - quarter of the shell length from the anterior , with slightly opisthogyrous beaks . Anterior margin broadly convex , flattish , passing into the very broad , gently convex ventral margin ...
Page 39
... broad , flattish anterior face , passing rather sharply into the broad , straight to slightly concave ventral margin . The posterodorsal margin is deeply concave and the narrow respiratory margin rounded . The escutcheon is broad ...
... broad , flattish anterior face , passing rather sharply into the broad , straight to slightly concave ventral margin . The posterodorsal margin is deeply concave and the narrow respiratory margin rounded . The escutcheon is broad ...
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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