#crustacean  any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton
  supertype:  #arthropod  invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
  subtype:  #malacostracan_crustacean  #decapod_crustacean  #brachyuran  #stomatopod_crustacean  #branchiopod_crustacean  #copepod_crustacean  #seed_shrimp  #barnacle
  member of:  #class_Crustacea
  part:  #green_gland__greengland  one of a pair of glands (believed to have excretory functions) in some crustaceans near the base of the large antennae
  part:  #nipper__claw__chela__pincer  a structure like a pincer on the limb of a crustacean or other arthropods

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