See text Littorinoidea are a superfamily of both sea snails and land snails which have a gill and an operculum, terrestrial and marine gastropod mollusks in the clade Littorinimorpha.

[2] The terrestrial family within this group, the Pomatiidae, are sometimes called "land winkles"[3] because the group originated in the sea and the closely related family Littorinidae are known as "winkles".

[4] These families and subfamilies have been recognized in the taxonomy of Bouchet & Rocroi (2005): (Extinct taxa are indicated by a dagger, †.)