Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 12
... similar Middle and Late Jurassic European Myophorella species ' ( p . 27 ) . On this basis Scaphogonia is retained as a valid subgenus of Myopho- rella , apparently endemic to North America . Similarly , there are a host of European ...
... similar Middle and Late Jurassic European Myophorella species ' ( p . 27 ) . On this basis Scaphogonia is retained as a valid subgenus of Myopho- rella , apparently endemic to North America . Similarly , there are a host of European ...
Page 15
... similar strength to those forming the marginal and escutcheon carinae , whereas the transverse growth striae of the area are replaced in maturity by coarse , irregular growth rugae . The earliest genus in the subfamily is Steinmanella ...
... similar strength to those forming the marginal and escutcheon carinae , whereas the transverse growth striae of the area are replaced in maturity by coarse , irregular growth rugae . The earliest genus in the subfamily is Steinmanella ...
Page 29
... similar ribs that are subvertical and only weakly curved . The posterior set of c . 18 costae are narrow , crowded , somewhat undu- latory , broader than the interspaces , almost straight , and inclined postero- ventrally . Ribbing is ...
... similar ribs that are subvertical and only weakly curved . The posterior set of c . 18 costae are narrow , crowded , somewhat undu- latory , broader than the interspaces , almost straight , and inclined postero- ventrally . Ribbing is ...
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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