Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 7
... Description Shell medium sized ( maximum length about 70 mm ) , trigonally ovate , elongate ( H / L 0,71-0,73 ) , with moderately elevated umbones situated about = C A B F D E Fig . 3. Trigonia LOWER CRETACEOUS TRIGONIOIDA FROM THE ...
... Description Shell medium sized ( maximum length about 70 mm ) , trigonally ovate , elongate ( H / L 0,71-0,73 ) , with moderately elevated umbones situated about = C A B F D E Fig . 3. Trigonia LOWER CRETACEOUS TRIGONIOIDA FROM THE ...
Page 41
... Description Shell large ( maximum length about 90 mm ) , higher than long ( H / L = 0,82 ) , strongly inequilateral , extremely inflated anteriorly ( H / W = 0,54 ) and rostrate posteriorly . Umbones very prominent , massive ...
... Description Shell large ( maximum length about 90 mm ) , higher than long ( H / L = 0,82 ) , strongly inequilateral , extremely inflated anteriorly ( H / W = 0,54 ) and rostrate posteriorly . Umbones very prominent , massive ...
Page 49
... description of a new species . Paläontologische Zeitschrift 63 ( 3/4 ) : 241–250 . Cox , L. R. 1952. Notes on the Trigoniidae with outlines of a classification of the family . Pro- ceedings of the Malacological Society of London 29 ( 2 ...
... description of a new species . Paläontologische Zeitschrift 63 ( 3/4 ) : 241–250 . Cox , L. R. 1952. Notes on the Trigoniidae with outlines of a classification of the family . Pro- ceedings of the Malacological Society of London 29 ( 2 ...
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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