|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Lingulata - Lingulida - Obolidae
It was recombined as Pachyglossella dorsiconvexa by Cooper (1960) and Hansen and Holmer (2011).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|G. A. Cooper 1956||Shell small, brown to blue-gray in color, elliptical in outline with the length slightly greater than the width ; greatest width at the middle. Pedicle valve with the posterolateral margins nearly straight and forming an apical angle of about 80° ; sides gently rounded ; anterior margin narrowly rounded ; pedicle valve with lateral profile gently convex and with the greatest convexity at about the middle; anterior and posterior slopes gentle ; anterior profile moderately convex. Pedicle interior with deep pedicle groove between lateral folds.
Brachial valve with subequally rounded extremities and gently rounded sides ; lateral profile strongly convex; greatest depth about one-third the length from the beak; anterior slope long and gentle; anterior profile somewhat narrowly rounded and with steep lateral slopes. Beak marginal. Surface of both valves marked by irregular, strong concentric undulations.
Brachial interior with thickened posterior margin which is not inflected. Muscle pattern not clear.