#seasnail  any of several creeping marine gastropods with a spirally coiled shell: whelks; tritons; moonshells; neritids
  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:  #neritid_gastropod__neritidgastropod__neritid  operculate seasnail of coastal waters with a short spiral shell
     subtype:  #nerita  having short a smooth or spirally ridged shell with thick usually toothed outer lip and toothed operculum
     subtype:  #bleeding_tooth__Nerita_peloronta  gastropod having reddish toothlike projections around the shell opening; of the Caribbean area
     subtype:  #neritina  ornately marked and brightly colored snails of brackish waters
  subtype:  #whelk  large carnivorous marine gastropods of coastal waters and intertidal regions having a strong snail-like shell
  subtype:  #triton  tropical marine gastropods having beautifully colored spiral shells
  subtype:  #moonshell  marine gastropods having smooth rounded shells that form short spires
  subtype:  #periwinkle.seasnail__winkle  edible marine gastropod
  subtype:  #limpet  any of various usually marine gastropods with low conical shells; found clinging to rocks in littoral areas
     subtype:  #common_limpet__Patella_vulgata  marine limpet
     subtype:  #keyhole_limpet__keyholelimpet__Fissurella_apertura__Diodora_apertura  marine limpet having a conical shell with an opening at the apex

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