#branchia__gill  respiratory organ of aquatic animals that breathe oxygen dissolved in water
  supertype:  respiratory_organ__respiratoryorgan  any organ involved in the process of respiration
  subtype:  ctenidium  comb-like respiratory structure serving as the gill of certain mollusks
  subtype:  ceras__cera  one of the often brightly colored and branching hornlike structures on the back of the nudibranch (and other related mollusks) that serve as gills
  subtype:  external_gill  occurs in some mollusks and in tadpoles and other immature amphibians

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