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
... concentric ribbing of the neanic stage is of such a character in both these species as to exclude them from ... costae , referring it instead to Megatrigonia . Subsequently , he identified it ( Nakano 1965 ) as Megatrigonia ? pongolensis ...
... concentric ribbing of the neanic stage is of such a character in both these species as to exclude them from ... costae , referring it instead to Megatrigonia . Subsequently , he identified it ( Nakano 1965 ) as Megatrigonia ? pongolensis ...
Page 25
... costae that are subconcentric anteriorly and curve strongly upwards posteriorly , cutting obliquely across the ... concentric ornament of the nepionic and middle growth stages is identical . Syrotrigonia may be distinguished , however ...
... costae that are subconcentric anteriorly and curve strongly upwards posteriorly , cutting obliquely across the ... concentric ornament of the nepionic and middle growth stages is identical . Syrotrigonia may be distinguished , however ...
Page 26
... concentric costae , broader than the interspaces , which flex slightly at the umbonal ridge before crossing onto the area . The ribs thin noticeably where they cross the longitudinal groove . Later flank costae are coarse , robust ...
... concentric costae , broader than the interspaces , which flex slightly at the umbonal ridge before crossing onto the area . The ribs thin noticeably where they cross the longitudinal groove . Later flank costae are coarse , robust ...
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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 |