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 order Littorinimorpha.
The terrestrial family within this group, the Pomatiidae, are sometimes called "land winkles"Journal of Molluscan Studies, GENETIC AND MORPHOLOGICAL VARIATION IN THE LAND WINKLE POMATIAS ELEGANS (MÜLLER) (CAENOGASTROPODA: POMATIASIDAE) Volume 67, Issue 2, pp 145–152 (http://mollus.oxfordjournals.org/content/67/2/145.abstract) Accessed 2014-9-2 because the group originated in the sea and the closely related family Littorinidae are known as "winkles".
Taxonomy These families and subfamilies have been recognized in the taxonomy of Bouchet & Rocroi (2005): Littorinidae Children, 1834 - the periwinkles Subfamily Littorininae Children, 1834 Subfamily Lacuninae Gray, 1857 Subfamily Laevilitorininae Reid, 1989 † Bohaispiridae Youluo, 1978 Pickworthiidae Iredale, 1917 Subfamily Pickworthiinae Iredale, 1917 (synonym: Reynellonidae Iredale, 1917) Subfamily Pelycidiinae Ponder & Hall, 1983 Subfamily Sherborniinae Iredale, 1917 Pomatiidae Newton, 1891 (1828) Subfamily Pomatiinae Newton, 1891 Annulariidae Henderson & Bartsch, 1920 Subfamily Annulariinae Henderson & Bartsch, 1920 Subfamily Rhytidopomatinae Henderson & Bartsch, 1920 Subfamily Tudorinae Watters, 2006 † Purpurinidae Zittel, 1895 Skeneopsidae Iredale, 1915 † Tripartellidae Gründel, 2001 Zerotulidae Warén & Hain, 1996
(Extinct taxa are indicated by a dagger, †.) Families brought into synonymy Bembiciidae: synonym of Lacuninae Cyclostomatidae: synonym of Pomatiidae Ericiidae: synonym of Pomatiidae Faxiidae: synonym of Sherborniinae Lacunidae: synonym of Littorinidae Melarhaphidae: synonym of Littorininae Reynellonidae: synonym of Pickworthiinae Risellidae: synonym of Lacuninae
References