Littorinimorpha is a large order of snails, gastropods within the Subclass Orthogastropoda, consisting primarily of sea snails (marine species), and also in addition some freshwater snails (aquatic species) and land snails (terrestrial species). 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.