Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 6
... prominent ; broad area with obliquely truncate respiratory margin ; posterodorsal margin straight ; flank ornament nontuberculate , subconcentric ; carinae prominent , generally persist- ing to maturity , with prominent antecarinal ...
... prominent ; broad area with obliquely truncate respiratory margin ; posterodorsal margin straight ; flank ornament nontuberculate , subconcentric ; carinae prominent , generally persist- ing to maturity , with prominent antecarinal ...
Page 10
... prominent nodes , longitudinal furrow delimited by prominent nodes , escutcheon with radial rows of nodes , area with transverse growth rugae in maturity , comprises Quadratotrigonia homoeo- morphs ; 6 = shell ovate , very broad ...
... prominent nodes , longitudinal furrow delimited by prominent nodes , escutcheon with radial rows of nodes , area with transverse growth rugae in maturity , comprises Quadratotrigonia homoeo- morphs ; 6 = shell ovate , very broad ...
Page 33
... prominent umbones are subtermi- nal , with strongly inturned , opisthogyrous beaks . The straight , subvertical anterior margin passes evenly into the almost straight ventral margin . The posterodorsal margin is broadly concave and the ...
... prominent umbones are subtermi- nal , with strongly inturned , opisthogyrous beaks . The straight , subvertical anterior margin passes evenly into the almost straight ventral margin . The posterodorsal margin is broadly concave and the ...
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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