Annals of the South African MuseumThe Museum, 1991 - Natural history |
From inside the book
Results 1-3 of 25
Page 13
... escutcheon is large , lanceolate , smooth , and extends almost the entire posterodorsal length of the shell . The marginal and escutcheon carinae are marked by rows of large , regular , obliquely clavate tubercles that increase in size ...
... escutcheon is large , lanceolate , smooth , and extends almost the entire posterodorsal length of the shell . The marginal and escutcheon carinae are marked by rows of large , regular , obliquely clavate tubercles that increase in size ...
Page 17
... escutcheon . The positions of the escutcheon and marginal carinae are marked by rows of prominent nodes , as is the dorsal edge of the longitudinal groove to the area . In maturity the tubercles of the escutcheon and marginal carinae ...
... escutcheon . The positions of the escutcheon and marginal carinae are marked by rows of prominent nodes , as is the dorsal edge of the longitudinal groove to the area . In maturity the tubercles of the escutcheon and marginal carinae ...
Page 24
... escutcheon is fairly narrow , and about two - thirds the length of the shell . It is ornamented by irregular oblique ... escutcheon . There are three rows of tubercles to the area , corresponding to the escutcheon and marginal carinae ...
... escutcheon is fairly narrow , and about two - thirds the length of the shell . It is ornamented by irregular oblique ... escutcheon . There are three rows of tubercles to the area , corresponding to the escutcheon and marginal carinae ...
Other editions - View all
Common terms and phrases
Algoa Basin Anditrigonia antecarinal sulcus anterior commissure anterolateral shoulder anteroventrally Apiotrigoniinae Bivalvia broad chevrons coarse commissure comprises convex Cooper Cretaceous Description Shell Diagnosis elongate escutcheon carina faunas finely crenulated flank costae flank ornament genus growth rugae growth striae Hauterivian Hoepen holotype inflated anteriorly interspaces Iotrigonia irregular Kobayashi kraussi Kitchin lanceolate large maximum length Lateral view lectotype left valve longitudinal groove Megatrigoniacea moderately Myophorella Myophoriidae Nakano neotype nepionic stages Neumayr nodate Nototrigoniinae opisthogyrous beaks Paranditrigonia paratypes persisting to maturity phyletic Port Elizabeth Museum posterior set posterodorsal margin Poulton Pterotrigonia radial costellae radial ornament Rennie respiratory margin Reyes ribs right valve rostrate shallowly concave shell length Skwarko smooth South African Museum Steinmanella herzogi Goldfuss straight strongly oblique subconcentric subfamily Sundays River Superfamily synonymy Tashiro Tithonian transverse costellae transverse ornament Trigonia Trigoniacea Trigoniinae trigonioid tubercles Type species Upper Valanginian V-shaped Valanginian vau Sharpe ventral margin ventricosa Krauss Yaadia