#garden_snail  any of several inedible snails of the genus Helix; often destructive pests
  supertype:  snail  freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell
  member of:  genus_Helix
  subtype:  brown_snail__brownsnail__Helix_aspersa  serious garden pest having a brown shell with paler zigzag markings; nearly cosmopolitan
  subtype:  Helix_hortensis  a kind of garden snail

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