Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumWest, Newman & Company for the trustees of the Museum, 1990 - Natural history |
From inside the book
Results 1-3 of 3
Page 24
... marginal carina lacking , resulting in poor discrimination between the smooth escutcheon and area . The latter is ornamented only in the nepionic stages and may be weakly bipartite . In some taxa there is a more or less prominent ...
... marginal carina lacking , resulting in poor discrimination between the smooth escutcheon and area . The latter is ornamented only in the nepionic stages and may be weakly bipartite . In some taxa there is a more or less prominent ...
Page 25
... marginal carina that was emphasized in the original diagnosis is not a true carina ( the latter is restricted to the nepionic stages ) but an umbonal ridge whose prominence is enhanced by the bounding antecarinal sulcus . Initially the ...
... marginal carina that was emphasized in the original diagnosis is not a true carina ( the latter is restricted to the nepionic stages ) but an umbonal ridge whose prominence is enhanced by the bounding antecarinal sulcus . Initially the ...
Page 26
... margin and transverse costellae to the escutcheon ( cf. Pérez & Reyes 1980 ) , characters that ally it with the ... marginal carina . The broad subtrigonal area is weakly concave , almost flat , and with an indistinct longitudinal ...
... margin and transverse costellae to the escutcheon ( cf. Pérez & Reyes 1980 ) , characters that ally it with the ... marginal carina . The broad subtrigonal area is weakly concave , almost flat , and with an indistinct longitudinal ...
Other editions - View all
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