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
... stage is of such a character in both these species as to exclude them from Indotrigonia in spite of adult similarities , and ... stages and may be weakly bipartite . In some taxa there is a more or less prominent umbonal ridge . Nepionic ...
... stage is of such a character in both these species as to exclude them from Indotrigonia in spite of adult similarities , and ... stages and may be weakly bipartite . In some taxa there is a more or less prominent umbonal ridge . Nepionic ...
Page 25
... nepionic stages ) but an umbonal ridge whose prominence is enhanced by the bounding antecarinal sulcus . Initially the tubercles on this ridge are no more than rib endings that are emphasized by the weakening of ornament across the ...
... nepionic stages ) but an umbonal ridge whose prominence is enhanced by the bounding antecarinal sulcus . Initially the tubercles on this ridge are no more than rib endings that are emphasized by the weakening of ornament across the ...
Page 26
... nepionic stages when it is ornamented . Marginal and inner carinae are lacking , but an umbonal ridge marks the position of the marginal carina . The broad subtrigonal area is weakly concave , almost flat , and with an indistinct ...
... nepionic stages when it is ornamented . Marginal and inner carinae are lacking , but an umbonal ridge marks the position of the marginal carina . The broad subtrigonal area is weakly concave , almost flat , and with an indistinct ...
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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 |