|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Lingulata - Lingulida - Obolidae
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.
|M. Mergl and P. Slehoferová 1990||Large obolid with tear-drop shaped outline, acutely pointed ventral beak, and moderate thick valves. Ventral pseudointerarea long, anteriorly undercut, divided by a deep, narrowly triangular pedicle groove into large prop areas with distinct flexure lines. Dorsal pseudointerarea anteriorly undercut, with a wide, gently concave median depression. Visceral area weakly defined, narrowly triangular in outline, with poorly impressed muscle scars. External ornamentation consists of coarse elevated concentric lines. On flanks, there are lines dichotomously or laterally branched, but in median sector, the lines are unbranched, with regular Course parallel with growth lines.|