|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Lingulata - Lingulida - Obolidae
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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 (Pachyglossa)||Elongate elliptical in outline, strongly biconvex but the brachial valve generally having the greater convexity. Shell usually thick. Surface marked only by growth lines and concentric wrinkles.
Interior of pedicle valve with posterior structure like that of Lingulella with a deep pedicle groove margined by concentrically marked thickenings. Posterior margin of brachial valve slightly thickened and without a posterior plate.