Helix is a genus of large, air-breathing land snails native to Europe and the Mediterranean region. They are the type genus of the family Helicidae, and are among the first animal genera described by Carl Linnaeus. Members of the genus first appeared during the Oligocene. Like most land snails, Helix species are hermaphroditic, and like other helicids, a courting pair will impale each other with hormone-rich love darts prior to exchanging sperm. Well-known species include Helix pomatia and Helix lucorum. Cornu aspersum – another well-known helicid – was originally described as a member of Helix, but the prevailing classification places it as the sole member of the sister genus Cornu.
Cochlostoma is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Cochlostomatidae.
Valvata is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.
Hygromiidae is a taxonomic family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.
Oxychilidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Gastrodontoidea.
Monacha is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the subfamily Trochulininae Lindholm, 1927 of the family Hygromiidae, the hairy snails and their allies.
Xerocrassa is a genus of small, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Geomitridae, the hairy snails and their allies.
Hyalina is a genus of sea snails, marine gastropod mollusks in the subfamily Pruninae of the family Marginellidae, the margin snails.
Geomitridae is a taxonomic family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.
