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
... Later flank ornament comprises costae that are subconcentric anteriorly , but posteriorly may be subconcentric , strongly oblique , or effaced . Discussion The origins of Rutitrigonia are cryptic . It first appears in the Bathonian of ...
... Later flank ornament comprises costae that are subconcentric anteriorly , but posteriorly may be subconcentric , strongly oblique , or effaced . Discussion The origins of Rutitrigonia are cryptic . It first appears in the Bathonian of ...
Page 26
... late Aptian age and corresponds broadly with Locality 164 of Kennedy & Klinger ( 1975 ) . Description Shell medium ... Later flank costae are coarse , robust , relatively distant and slightly I D A E B C F Fig . 1. A 26 ANNALS OF THE ...
... late Aptian age and corresponds broadly with Locality 164 of Kennedy & Klinger ( 1975 ) . Description Shell medium ... Later flank costae are coarse , robust , relatively distant and slightly I D A E B C F Fig . 1. A 26 ANNALS OF 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
Bibliographic information
| Title | Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum Volume 99, Issue 3 of Annals of the South African Museum, South African Museum |
| Author | South African Museum |
| Publisher | West, Newman & Company for the trustees of the Museum, 1990 |
| Original from | the University of California |
| Digitized | 21 Jul 2016 |
| ISBN | 0868131083, 9780868131085 |
| Export Citation | BiBTeX EndNote RefMan |