Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 6
... appearance of Minetri- goniidae and the first appearance of Neotrigoniinae . Diagnosis Family Trigoniidae Lamarck , 1819 Trigonal to rhomboidal , very inequilateral trigoniaceans ; dentition trigo- nian , with conspicuously striated ...
... appearance of Minetri- goniidae and the first appearance of Neotrigoniinae . Diagnosis Family Trigoniidae Lamarck , 1819 Trigonal to rhomboidal , very inequilateral trigoniaceans ; dentition trigo- nian , with conspicuously striated ...
Page 9
... appearance . The flanks are ornamented with up to 28 pronounced , subconcentric costae that are slightly narrower than the interspaces on the posterior half of the shell . In maturity , the ribs flex slightly upwards anteriorly ...
... appearance . The flanks are ornamented with up to 28 pronounced , subconcentric costae that are slightly narrower than the interspaces on the posterior half of the shell . In maturity , the ribs flex slightly upwards anteriorly ...
Page 26
... appearance of the subfamily there are two dis- tinct phyletic lines ( cf. Tashiro 1979 , figs 17-18 ) . Skwarko ( 1970 ) , Nakano ( 1971 ) and Tashiro ( 1979 ) consider Trigonia calderoni Castillo & Aguilerae from the Oxfordian ...
... appearance of the subfamily there are two dis- tinct phyletic lines ( cf. Tashiro 1979 , figs 17-18 ) . Skwarko ( 1970 ) , Nakano ( 1971 ) and Tashiro ( 1979 ) consider Trigonia calderoni Castillo & Aguilerae from the Oxfordian ...
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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