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
... coarse oblique flank costae , referring it instead to Megatrigonia . Subsequently , he identified it ( Nakano 1965 ) as Megatrigonia ? pongolensis ( Rennie ) . Given the large number of Rutitrigonia species now known , it is clear that ...
... coarse oblique flank costae , referring it instead to Megatrigonia . Subsequently , he identified it ( Nakano 1965 ) as Megatrigonia ? pongolensis ( Rennie ) . Given the large number of Rutitrigonia species now known , it is clear that ...
Page 25
... coarse , robust , relatively sparse costae that are subconcentric anteriorly and curve strongly upwards posteriorly , cutting obliquely across the growth striae . Age : Lower Cretaceous ( Neocomian- Aptian ) . Discussion Zulutrigonia ...
... coarse , robust , relatively sparse costae that are subconcentric anteriorly and curve strongly upwards posteriorly , cutting obliquely across the growth striae . Age : Lower Cretaceous ( Neocomian- Aptian ) . Discussion Zulutrigonia ...
Page 26
... coarse 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 ...
... coarse 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 ...
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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 comma separates comprises coarse concentric costae curve strongly upwards described Haughton 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