Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 8
... lateral views of an unnum- bered right valve in the South African Museum . Note the absence of an antecarinal sulcus . D - E . SAM - D1876 , a right valve . D. Lateral view showing obliquity and crowding of flank costae anteriorly . E ...
... lateral views of an unnum- bered right valve in the South African Museum . Note the absence of an antecarinal sulcus . D - E . SAM - D1876 , a right valve . D. Lateral view showing obliquity and crowding of flank costae anteriorly . E ...
Page 18
... Lateral and dorsal views of an aberrant individual in which the flank costae are interrupted anteroventrally . C. Lateral view of a frag- mentary left valve from the Mngazana Formation of Transkei , in the South African Museum . D - E ...
... Lateral and dorsal views of an aberrant individual in which the flank costae are interrupted anteroventrally . C. Lateral view of a frag- mentary left valve from the Mngazana Formation of Transkei , in the South African Museum . D - E ...
Page 45
... Lateral view of the specimen in the South African Museum figured by Kitchin ( 1908 ) . B - C . Lateral and dorsal views of a right valve in the Port Elizabeth Museum . D. Right valve of a posteriorly elongate individual in the Port ...
... Lateral view of the specimen in the South African Museum figured by Kitchin ( 1908 ) . B - C . Lateral and dorsal views of a right valve in the Port Elizabeth Museum . D. Right valve of a posteriorly elongate individual in the Port ...
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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