Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 24
... follow the growth striae . Posteriorly these tubercles are continuous with the growth rugae of the area . There is a very narrow lunule , about 40 per cent of the shell height . The ligament pit is moderately developed , lanceolate ...
... follow the growth striae . Posteriorly these tubercles are continuous with the growth rugae of the area . There is a very narrow lunule , about 40 per cent of the shell height . The ligament pit is moderately developed , lanceolate ...
Page 29
... follow about seven 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 ...
... follow about seven 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 ...
Page
... follow the name of the taxon without intervening punctuation and not be abbreviated ; if the year is added , a comma must separate author's name and year . The author's name ( and date , if cited ) must be placed in parentheses if a ...
... follow the name of the taxon without intervening punctuation and not be abbreviated ; if the year is added , a comma must separate author's name and year . The author's name ( and date , if cited ) must be placed in parentheses if a ...
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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