Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 10
... flank costation , Myophorellidae ( Myophorellinae and Steinmanellinae subfam . nov . ) with obliquely nodate flank costation , and the derived Vaugoniidae ( Vaugoniinae and Quadratotrigoniinae ) with nodate , V - shaped flank costae ...
... flank costation , Myophorellidae ( Myophorellinae and Steinmanellinae subfam . nov . ) with obliquely nodate flank costation , and the derived Vaugoniidae ( Vaugoniinae and Quadratotrigoniinae ) with nodate , V - shaped flank costae ...
Page 11
... flank costae in the early and middle growth stages . Family Myophorellidae Kobayashi , 1954 ( nom . transl . herein ex subfamily Myophorellinae Kobayashi , 1954 ) Diagnosis Myophorellaceans with generally conspicuously nodate flank costae ...
... flank costae in the early and middle growth stages . Family Myophorellidae Kobayashi , 1954 ( nom . transl . herein ex subfamily Myophorellinae Kobayashi , 1954 ) Diagnosis Myophorellaceans with generally conspicuously nodate flank costae ...
Page 37
... flank costae are subconcen- tric . Later flank costae are strongly oblique but not sharply discrepant and extend to the anterior commissure . The anterior 12 or so costae are narrower than or as broad as the interspaces , finely but ...
... flank costae are subconcen- tric . Later flank costae are strongly oblique but not sharply discrepant and extend to the anterior commissure . The anterior 12 or so costae are narrower than or as broad as the interspaces , finely but ...
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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