Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 10
... rows of nodes or becoming obsolete in maturity , area often with transverse growth rugae in maturity ; 5 = large , massive , carinae replaced by prominent nodes , longitudinal furrow delimited by prominent nodes , escutcheon with radial ...
... rows of nodes or becoming obsolete in maturity , area often with transverse growth rugae in maturity ; 5 = large , massive , carinae replaced by prominent nodes , longitudinal furrow delimited by prominent nodes , escutcheon with radial ...
Page 19
... rows of prominent nodes that curve slightly to the anterior , the nodes becoming more crowded ventrally with an occasional intercalated row along the anteroventral margin . The interspaces are slightly narrower than the rows of nodes ...
... rows of prominent nodes that curve slightly to the anterior , the nodes becoming more crowded ventrally with an occasional intercalated row along the anteroventral margin . The interspaces are slightly narrower than the rows of nodes ...
Page 24
... rows of tubercles to the area , corresponding to the escutcheon and marginal carinae and the dorsal margin of the longitudinal groove . The number of tubercles in the marginal row approximates the number of flank costae . At lengths of ...
... rows of tubercles to the area , corresponding to the escutcheon and marginal carinae and the dorsal margin of the longitudinal groove . The number of tubercles in the marginal row approximates the number of flank costae . At lengths of ...
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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