Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumWest, Newman & Company for the trustees of the Museum, 1990 - Natural history |
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Page 24
... escutcheon and area . The latter is ornamented only in the nepionic stages and may be weakly bipartite . In some taxa there is a more or less prominent umbonal ridge . Nepionic ornament comprises concentric costae that pass ...
... escutcheon and area . The latter is ornamented only in the nepionic stages and may be weakly bipartite . In some taxa there is a more or less prominent umbonal ridge . Nepionic ornament comprises concentric costae that pass ...
Page 25
... Escutcheon narrow , indistinct , not sunken . Broad subtrigonal area essentially flat , meeting the posterodorsal commissure in an acute angle , so that the shell is fastigiate ( roof - shaped ) posteriorly . Ornament comprises coarse ...
... Escutcheon narrow , indistinct , not sunken . Broad subtrigonal area essentially flat , meeting the posterodorsal commissure in an acute angle , so that the shell is fastigiate ( roof - shaped ) posteriorly . Ornament comprises coarse ...
Page 26
... escutcheon ( cf. Pérez & Reyes 1980 ) , characters that ally it with the Apiotrigoniinae and Pterotrigoniinae . Zulutrigonia pongolensis ( Rennie , 1936 ) Fig . 1A - E Trigonia ( Rutitrigonia ) pongolensis Rennie , 1936 : 359 , pl . 41 ...
... escutcheon ( cf. Pérez & Reyes 1980 ) , characters that ally it with the Apiotrigoniinae and Pterotrigoniinae . Zulutrigonia pongolensis ( Rennie , 1936 ) Fig . 1A - E Trigonia ( Rutitrigonia ) pongolensis Rennie , 1936 : 359 , pl . 41 ...
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Common terms and phrases
abbreviated according to chronology acute angle Aitken ANNALS antecarinal sulcus bicuspidata Gould Broad subtrigonal area Cape Town comprises coarse concentric costae curve strongly upwards described Haughton Diagnosis Shell escutcheon fastigiate roof-shaped flank costae Gastropoda GENUS OF RUTITRIGONIINAE Hoepen holotype Kobayashi krenkeli Lamarck Lange Later flank Leda LOWER CRETACEOUS APTIAN margin and obliquely marginal carina Megatrigonia middle growth stages Nakano namacolus nepionic stages noteworthy similarities Nucula obliquely truncate opisthogyrous beaks ornament comprises paratypes parentheses posterodorsal commissure punctuation reduction or enlargement references registration number respiratory margin ribbing Roman numerals RUTITRIGONIINAE BIVALVIA scientific name separate author's name shell is fastigiate Shell medium sized shouldered italics Smith South African Museum species straight posterodorsal margin strongly upwards posteriorly subconcentric subheadings are shouldered subterminal umbones subtrapezoidal Synonymy arrangement Syrotrigonia taxa Trigonia Rutitrigonia TRIGONIACEA umbonal ridge V-shaped costae ventral margin VOLUME 99 volume number Von Huene weakly ZULULAND Zulutrigonia gen Zulutrigonia pongolensis Rennie