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
... flank costae , referring it instead to Megatrigonia . Subsequently , he identified it ( Nakano 1965 ) as ... costae that pass uninterrupted on to the area where they weaken across the longitudinal furrow . Later flank ornament comprises ...
... flank costae , referring it instead to Megatrigonia . Subsequently , he identified it ( Nakano 1965 ) as ... costae that pass uninterrupted on to the area where they weaken across the longitudinal furrow . Later flank ornament comprises ...
Page 26
... flank costae in the early to middle growth stages , an internally crenulated posteroventral margin and transverse ... costae , broader than the interspaces , which flex slightly at the umbonal ridge before crossing onto the area . The ...
... flank costae in the early to middle growth stages , an internally crenulated posteroventral margin and transverse ... costae , broader than the interspaces , which flex slightly at the umbonal ridge before crossing onto the area . The ...
Page 28
... flanks unornamented . Trigonia inca Fritzsche ( 1921 : 49 , pl . 3 ( figs 1-3 ) ) from the Barremian of northern Peru shows some similarity to Zulutrigonia . However , its flank costae form distinct chevrons in maturity and hence it may ...
... flanks unornamented . Trigonia inca Fritzsche ( 1921 : 49 , pl . 3 ( figs 1-3 ) ) from the Barremian of northern Peru shows some similarity to Zulutrigonia . However , its flank costae form distinct chevrons in maturity and hence it may ...
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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