#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
  part:  green_gland  nipper
  member of:  class_Crustacea
  subtype:  malacostracan_crustacean__malacostracancrustacean  a major subclass of crustaceans
     subtype:  krill  shrimp-like planktonic crustaceans; major source of food for e.g. baleen whales
        subtype:  Euphausia_pacifica  food for jellyfish
     subtype:  opossum_shrimp__opossumshrimp  shrimp-like crustaceans whose females carry eggs and young in a pouch between the legs
     subtype:  isopod  any of various small terrestrial or aquatic crustaceans with seven pairs of legs adapted for crawling
        subtype:  woodlouse__slater  any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats
           subtype:  pill_bug  small terrestrial isopod with a convex segmented body that can roll up into a ball
           subtype:  sow_bug__sowbug  terrestrial isopod having an oval segmented body (a shape like a sow)
        subtype:  sea_louse__sealouse__sea_slater__seaslater  marine isopod crustacean
     subtype:  amphipod  a kind of malacostracan crustacean
        subtype:  beach_flea__beachflea__sand_hopper__sand_flea  small amphipod crustaceans that hop like fleas; common on ocean beaches
        subtype:  skeleton_shrimp  small amphipod crustacean having a grotesque form suggestive of the praying mantis; found chiefly on seaweed
        subtype:  whale_louse__whalelouse  amphipod crustacean parasitic on cetaceans
  subtype:  decapod_crustacean__decapodcrustacean__decapod  crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax
     subtype:  crab  decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers
        subtype:  Menippe_mercenaria__stone_crab__stonecrab  large edible crab of S coat of United States especially Florida
        subtype:  hard-shell_crab  edible crab that has not recently molted and so has a hard shell
        subtype:  soft-shell_crab__soft-shelled_crab  edible crab that has recently molted and not yet formed its new shell
        subtype:  Cancer_magister__Dungeness_crab  small edible crab of Pacific coast of North America
        subtype:  rock_crab__Cancer_irroratus  crab of eastern coast of North America
        subtype:  Jonah_crab__Cancer_borealis  large red deep-water crab of the eastern coast of North America
        subtype:  swimming_crab  marine crab with some legs flattened and fringed for swimming
           subtype:  English_lady_crab__Portunus_puber  crab of the English coasts
           subtype:  American_lady_crab__lady_crab__calico_crab__Ovalipes_ocellatus  brightly spotted crab of sandy beaches of the United States Atlantic coast
           subtype:  Callinectes_sapidus__blue_crab  bluish edible crab of Atlantic and Gulf coasts of North America
        subtype:  fiddler_crab__fiddlercrab  burrowing crab of American coastal regions having one claw much enlarged in the male
        subtype:  pea_crab__peacrab  tiny soft-bodied crab living commensally in the mantles of certain bivalve mollusks
           subtype:  oyster_crab__Pinnotheres_ostreum  tiny soft-bodied crab living within the mantle cavity of oysters
        subtype:  Paralithodes_camtschatica__king_crab__Alaska_crab__Alaskan_king_crab__Alaska_king_crab  large edible crab of North Pacific waters especially along the coasts of Alaska and Japan
        subtype:  spider_crab  any of numerous crabs with very long legs and small triangular bodies
           subtype:  European_spider_crab__king_crab__Maja_squinado  large European spider crab
           subtype:  giant_crab__giantcrab__Macrocheira_kaempferi  very large deep-water Japanese crab
     subtype:  lobster  any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae
        subtype:  true_lobster  large edible marine crustaceans having large pincers on the first pair of legs
           subtype:  Homarus_americanus__American_lobster__Northern_lobster__Maine_lobster  lobster of Atlantic coast of America
           subtype:  Homarus_vulgaris__European_lobster  lobster of Atlantic coast of Europe
           subtype:  Cape_lobster__Homarus_capensis  small lobster of southern Africa
        subtype:  Norway_lobster__Nephrops_norvegicus  edible European lobster resembling the American lobster but slenderer
        subtype:  crawfish__spiny_lobster__spinylobster__langouste__rock_lobster__crayfish__sea_crawfish__seacrawfish  large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters
     subtype:  crawdaddy__crayfish__crawfish__crawdad  small freshwater decapod crustacean that resembles a lobster
        subtype:  Old_World_crayfish__ecrevisse  small crayfish of Europe and Asia and western North America
        subtype:  American_crayfish  common large crayfishes of eastern North America
     subtype:  hermit_crab  small soft-bodied marine crustaceans living in cast-off shells of gastropods
     subtype:  shrimp  small slender-bodied chiefly marine decapod crustaceans with a long tail and single pair of pincers; many species are edible
        subtype:  snapping_shrimp__pistol_shrimp  small shrimp that makes a snapping noise with one of their enlarged chelae
     subtype:  prawn  shrimp-like decapod crustacean having two pairs of pincers; most are edible
        subtype:  long-clawed_prawn__river_prawn__Palaemon_australis  large (a foot or more) edible freshwater prawn common in Australian rivers
     subtype:  tropical_prawn  edible tropical and warm-water prawn
  subtype:  brachyuran  typical crabs
  subtype:  stomatopod_crustacean__stomatopod  a kind of crustacean
     subtype:  mantis_shrimp__mantis_crab  tropical marine burrowing crustaceans with large grasping appendages
        subtype:  squilla__mantis_prawn  a kind of mantis shrimp
  subtype:  branchiopod_crustacean__branchiopodcrustacean__branchiopod__branchiopodan  aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding
     subtype:  daphnia__water_flea__waterflea  minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae
     subtype:  fairy_shrimp__fairyshrimp  small freshwater branchiopod having a transparent body with many appendages; swims on its back
     subtype:  brine_shrimp__brineshrimp__Artemia_salina  common to saline lakes
     subtype:  tadpole_shrimp__tadpoleshrimp  a kind of branchiopod crustacean
  subtype:  copepod_crustacean__copepodcrustacean__copepod  minute marine or fresh-water crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish
     subtype:  brit__britt  minute crustaceans forming food for right whales
     subtype:  cyclops__cyclop__water_flea__waterflea  minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms
     subtype:  fish_louse  a kind of copepod
  subtype:  seed_shrimp__mussel_shrimp__ostracod  tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell
  subtype:  barnacle__cerriped__cerripede  marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces
     subtype:  acorn_barnacle__acornbarnacle__rock_barnacle__Balanus_balanoides  barnacle that attaches to rocks especially in intertidal zones
     subtype:  goose_barnacle__goosebarnacle__lepasfasciculari  stalked barnacle that attaches to ship bottoms or floating timbers

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