Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 4
... valve opithsocline , simple or bilobed ; two main teeth of right valve asymmetrical , posterior one generally longer and narrower . Additional teeth may be present in left valve , on one or both sides of main tooth , whereas additional ...
... valve opithsocline , simple or bilobed ; two main teeth of right valve asymmetrical , posterior one generally longer and narrower . Additional teeth may be present in left valve , on one or both sides of main tooth , whereas additional ...
Page 8
... 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. Dorsal view of umbonal region , x 2 ...
... 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. Dorsal view of umbonal region , x 2 ...
Page 45
... valve in the Port Elizabeth Museum . D. Right valve of a posteriorly elongate individual in the Port Elizabeth Museum . E - F . Lateral and dorsal views of a left valve in which the posterior branches of the flank costae are unusually ...
... valve in the Port Elizabeth Museum . D. Right valve of a posteriorly elongate individual in the Port Elizabeth Museum . E - F . Lateral and dorsal views of a left valve in which the posterior branches of the flank costae are unusually ...
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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