#snail  freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell
  supertype:  #gastropod__univalve  a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes
  subtype:  #scorpion_shell  any of numerous tropical marine snails that as adults have the outer lip of the aperture produced into a series of long curved spines
  subtype:  #edible_snail__Helix_pomatia  one of the chief edible snails
  subtype:  #garden_snail  any of several inedible snails of the genus Helix; often destructive pests
     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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