Annals of the South African MuseumThe Museum, 1991 - Natural history |
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... Iotrigonia , Megatrigonia , Pisotrigonia and Pterotrigonia ) . These taxa represent six subfamilies in four families . Introduction .. Geology Systematic palaeontology CONTENTS Superfamily Myophoriacea Superfamily Trigoniacea ...
... Iotrigonia , Megatrigonia , Pisotrigonia and Pterotrigonia ) . These taxa represent six subfamilies in four families . Introduction .. Geology Systematic palaeontology CONTENTS Superfamily Myophoriacea Superfamily Trigoniacea ...
Page 43
... Iotrigonia van Hoepen , 1929 Type species . Iotrigonia crassitesta van Hoepen , 1929 ; by original desig- nation . Diagnosis Area unornamented beyond the nepionic stages and with a rounded respir- atory margin . Anterior flank costae ...
... Iotrigonia van Hoepen , 1929 Type species . Iotrigonia crassitesta van Hoepen , 1929 ; by original desig- nation . Diagnosis Area unornamented beyond the nepionic stages and with a rounded respir- atory margin . Anterior flank costae ...
Page 45
South African Museum. A B D C F E Fig . 24. Iotrigonia vau ( Sharpe ) , × 1. A. 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 ...
South African Museum. A B D C F E Fig . 24. Iotrigonia vau ( Sharpe ) , × 1. A. 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 ...
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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