|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Rafinesquinidae
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.
|J. K. Pope 1982||Large, thin-shelled leptaenid with free margin uniformly rounded. Cardinal angles orthogonal to alate. Geniculation at about 15 mm from beak, not preceded by a prominent depression or ridge. Costellae coarse and wavering; rugae discontinuous, moderate in number and height. Diductor muscle scar not bordered by a ridge.|