|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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.
|P. Yu. Parkhaev 2001||Gastropods with originally symmetrical cap-shaped or planispiral shell. Advanced representatives could have a turbospiral shell with hardly projected spire.|
|P. Y. Parkhaev and Y. Demidenko 2010||"Shell symmetrical, cap-shaped, planospiral or almost planospiral, composed of few whorls (paucispiral). Representatives with planospiral shell have elongated aperture. Length of aperture exceeds, equal or slightly less than shell diameter. Mantle caecum, probably, absent."|