[6] This Caenogastropoda combines the older taxa Mesogastropoda and Stenoglossa from the classification by Johannes Thiele[7] and is equivalent to the revised Monotocardia as defined by Mörch in 1865.

Caenogastropoda can be divided into two major groups, based on the anatomy of the radula: Ponder & Lindberg, 1997 and others since (e.g. Vega et al., 2006;[8] Harzhauser, 2004;[9] and Pina, 2002.

The following classification was laid out in the taxonomy of Bouchet & Rocroi (2005):[7] Colgan et al. (2006)[11] provided further insight into the phylogeny of Caenogastropoda.

Neotaenioglossa Haller, 1892 suggested in Ruud Bank's draft for Fauna Europaea is not retained because it would need severe emendation to remove Pyramidellids, Cerithioids, etc.

Although cladistically sound, the taxon Sorbeoconcha is skipped in the classification scheme because (1) ten years after its publication, the name still sounds unfamiliar to most and (2) it is not very helpful in the classification because it includes the bulk of Caenogastropoda (only keeping out small stem groups Abyssochrysidae, Provannidae, and the architaenioglossate taxa).