Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 10
... transverse ornament ; 2 = antecarinal sulcus virtually obsolete , nodose flank costae oblique , escutcheon sometimes with transverse costellae , longitudinal furrow to area often delimited by row of nodes ; 3 = flank costae form ...
... transverse ornament ; 2 = antecarinal sulcus virtually obsolete , nodose flank costae oblique , escutcheon sometimes with transverse costellae , longitudinal furrow to area often delimited by row of nodes ; 3 = flank costae form ...
Page 11
... transversely ornamented ; area with fine transverse costel- lae ; costae oblique over much of flank , often discontinuous anteroventrally or joined by intercalatories . Discussion Morphologically the most primitive myophorelline is ...
... transversely ornamented ; area with fine transverse costel- lae ; costae oblique over much of flank , often discontinuous anteroventrally or joined by intercalatories . Discussion Morphologically the most primitive myophorelline is ...
Page 25
... transverse costellae ; 5 = posteriorly produced to rostrate , often inflated anteriorly , in some with subterminal umbones , flank costae strongly oblique varying from finely crenulated to spinose , respiratory margin generally rounded ...
... transverse costellae ; 5 = posteriorly produced to rostrate , often inflated anteriorly , in some with subterminal umbones , flank costae strongly oblique varying from finely crenulated to spinose , respiratory margin generally rounded ...
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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