Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 11
... enlarged nodes to the anterolateral shoulder , and short subhorizontal costae to the flat anterior face . Genus Myophorella Bayle , 1878 Type species . Trigonia nodulosa LOWER CRETACEOUS TRIGONIOIDA FROM THE ALGOA BASIN 11.
... enlarged nodes to the anterolateral shoulder , and short subhorizontal costae to the flat anterior face . Genus Myophorella Bayle , 1878 Type species . Trigonia nodulosa LOWER CRETACEOUS TRIGONIOIDA FROM THE ALGOA BASIN 11.
Page 33
... face meets the flanks at prominent anterolateral shoulders . The escutcheon is very broad , sunken , and extends almost the entire postero- dorsal length of the shell . It is ornamented with numerous , finely beaded , transverse ...
... face meets the flanks at prominent anterolateral shoulders . The escutcheon is very broad , sunken , and extends almost the entire postero- dorsal length of the shell . It is ornamented with numerous , finely beaded , transverse ...
Page 39
... 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 , deeply sunken , lanceolate ...
... 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 , deeply sunken , lanceolate ...
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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