[3] Terrestrial lifestyles have evolved at least three separate occasions in neritimorphs: the extinct Dawsonellidae and the extant Helicinidae and Hydrocenidae.

[6] Neritimorpha has an extremely rich geologic history, going back to early Ordovician.

[4] According to the taxonomy of the Gastropoda (Ponder & Lindberg, 1997) Neritopsina is a gastropod superorder in the subclass Orthogastropoda.

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005[10] categorizes Neritimorpha as a gastropod mollusk clade.

Clades (and uncertain position taxa) in Neritimorpha include: Four extant superfamilies are recognised: Helicinoidea, Hydrocenoidea, Neritoidea and Neritopsoidea.