See text Littorinimorpha is a large order of snails,[1] gastropods, consisting primarily of sea snails (marine species), but also including some freshwater snails (aquatic species) and land snails (terrestrial species).

[2] Previously, the Linnaean taxonomy used in the taxonomy of the Gastropoda by Ponder & Lindberg (1997) ranked like this: subclass Orthogastropoda, superorder Caenogastropoda, order Sorbeoconcha, suborder Hypsogastropoda, infraorder Littorinimorpha.

[3] Evidence for this group being monophyletic is scanty.

In 2003, E. E. Strong[4] suggested using only Neogastropoda as a clade within the clade Hypsogastropoda, and to include the unresolved superfamilies of the Hypsogastropoda within the Littorinimorpha.

[5] The superfamilies grouped in this clade include a few families that are well-known based on their shells: (Extinct taxa indicated by a dagger, †.)