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 25
... middle growth stages is identical . Syrotrigonia may be distinguished , however , by its more ovate outline , the possession of a marginal carina that becomes a tuberculate umbonal ridge in maturity , the presence of a broad shallow ...
... middle growth stages is identical . Syrotrigonia may be distinguished , however , by its more ovate outline , the possession of a marginal carina that becomes a tuberculate umbonal ridge in maturity , the presence of a broad shallow ...
Page 26
... middle growth stages , an internally crenulated posteroventral margin and transverse costellae to the escutcheon ( cf. Pérez & Reyes 1980 ) , characters that ally it with the Apiotrigoniinae and Pterotrigoniinae . Zulutrigonia ...
... middle growth stages , an internally crenulated posteroventral margin and transverse costellae to the escutcheon ( cf. Pérez & Reyes 1980 ) , characters that ally it with the Apiotrigoniinae and Pterotrigoniinae . Zulutrigonia ...
Page 28
... growth striae obliquely and approaching the area almost at right angles . In the middle growth stages the ribs terminate at the umbonal ridge but in maturity they weaken and become effaced before reaching the area . The flank costae ...
... growth striae obliquely and approaching the area almost at right angles . In the middle growth stages the ribs terminate at the umbonal ridge but in maturity they weaken and become effaced before reaching the area . The flank costae ...
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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 |