|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Strophomenidae
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.
|I. F. Nikitin et al. 2003||Convexiconcave to convexiplane, transverse, suboval shell about 75% as long as wide with flattened lateral ventral profile; dorsal valve moderately and evenly convex, about 20% as high as long with very weak umbonal sulcus fading anteriorly; radial ornament unequally parvicostellate with 13–15 ribs per 3mm along the anterior margin of mature specimens and with up to 5 parvicostellae in interspaces between accentuated ribs.|