|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Strophomenata - Strophomenida - Sowerbyellidae
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.
|C. M. O. Rasmussen et al. 2012||Shell moderately concavo-convex, with transverse outline, twice as wide as long. Cardinal angles acute. Apical pseudodeltidium possibly present. Chilidium present. Faintly developed unequally parvicostellate ornamentation with three prominent costae. Angle of 45 degrees between two consecutive costae. Ventral interior with small teeth, not supported by dental plates. Dorsal interior with undercut, probably bilobed, cardinal process. Socket ridges wide, curving back laterally towards hinge line. Anteriorly elevated dorsal median ridge and pair of prominent side septa. Side septa bisecting, but confined within a bilobed, subelliptical bema.|