Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 25
... Hoepen , 1929 ( nom . transl . herein ex subfamily Megatrigoniinae van Hoepen , 1929 ) Diagnosis Commonly pyriform to subovate megatrigoniaceans that are generally weakly inflated anteriorly ; carinae lacking or generally restricted to ...
... Hoepen , 1929 ( nom . transl . herein ex subfamily Megatrigoniinae van Hoepen , 1929 ) Diagnosis Commonly pyriform to subovate megatrigoniaceans that are generally weakly inflated anteriorly ; carinae lacking or generally restricted to ...
Page 27
... Hoepen , 1929 Type species . Megatrigonia obesa van Hoepen , 1929 ; by original desig- nation . Diagnosis Very large , robust megatrigoniids with nontuberculate flank costae that pinch and swell irregularly without forming discrete ...
... Hoepen , 1929 Type species . Megatrigonia obesa van Hoepen , 1929 ; by original desig- nation . Diagnosis Very large , robust megatrigoniids with nontuberculate flank costae that pinch and swell irregularly without forming discrete ...
Page 39
... Hoepen number D1841 . Description = Shell medium sized ( maximum length 50 mm ) , strongly inequilateral , as high as long ( H / L 0,91-1,13 ) , anteriorly extremely inflated ( H / W = 0,47-0,54 ) and rostrate posteriorly . Conjoined ...
... Hoepen number D1841 . Description = Shell medium sized ( maximum length 50 mm ) , strongly inequilateral , as high as long ( H / L 0,91-1,13 ) , anteriorly extremely inflated ( H / W = 0,47-0,54 ) and rostrate posteriorly . Conjoined ...
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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