#shark  any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
  supertype:  elasmobranch__selachian  any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates
  subtype:  cow_shark__cowshark__six-gilled_shark__Hexanchus_griseus  large primitive shark widely distributed in warm seas
  subtype:  mackerel_shark  fierce pelagic and oceanic sharks
     subtype:  porbeagle__Lamna_nasus  voracious pointed-nose shark of northern Atlantic and Pacific
     subtype:  mako_shark__mako  powerful mackerel shark of the Atlantic and Pacific
        subtype:  shortfin_mako__Isurus_oxyrhincus  very swift active bluish shark found worldwide in warm waters; important game fish
        subtype:  longfin_mako__longfinmako__Isurus_paucus  similar to shortfin mako but darker blue
        subtype:  bonito_shark__blue_pointed__Isurus_glaucus  common blue-gray shark of southwest Pacific; sport and food fish
     subtype:  great_white_shark__greatwhiteshark__white_shark__whiteshark__man-eater__maneater__man-eating_shark__Carcharodon_carcharias  large aggressive shark widespread in warm seas; known to attack humans
     subtype:  basking_shark__baskingshark__Cetorhinus_maximus  large harmless plankton-eating northern shark; often swims slowly or floats at the sea surface
  subtype:  thresher_shark__thresher__thrasher__fox_shark__foxshark__Alopius_vulpinus  large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed
  subtype:  carpet_shark__Orectolobus_barbatus  shark of the western Pacific with flattened body and mottled skin
  subtype:  nurse_shark__Ginglymostoma_cirratum  small bottom-dwelling shark of warm shallow waters on both coasts of North and South America and from southeast Asia to Australia
  subtype:  sand_tiger__sand_shark__Carcharias_taurus__Odontaspis_taurus  shallow-water shark with sharp jagged teeth found on both sides of Atlantic; sometimes dangerous to swimmers
  subtype:  whale_shark__whaleshark__Rhincodon_typus  large spotted shark of warm surface waters worldwide; resembles a whale and feeds chiefly on plankton
  subtype:  cat_shark__catshark  small bottom-dwelling sharks with catlike eyes; found along continental slopes
  subtype:  requiem_shark__requiemshark  any of numerous sharks from small relatively harmless bottom-dwellers to large dangerous oceanic and coastal species
     subtype:  bull_shark__cub_shark__cubshark__Carcharhinus_leucas  a most common shark in temperate and tropical coastal waters worldwide; heavy-bodied and dangerous
     subtype:  sandbar_shark__sandbarshark__Carcharhinus_plumbeus  most common gray shark along coasts of middle Atlantic states; sluggish and occasionally caught by fishermen
     subtype:  blacktip_shark__sandbar_shark__sandbarshark__Carcharhinus_limbatus  widely distributed shallow-water shark with fins seemingly dipped in ink
     subtype:  oceanic_whitetip_shark__whitetip_shark__white-tipped_shark__Carcharinus_longimanus  large deep-water shark with white-tipped dorsal fin; worldwide distribution; most dangerous shark
     subtype:  dusky_shark__duskyshark__Carcharhinus_obscurus  relatively slender blue-gray shark; nearly worldwide in tropical and temperate waters
     subtype:  lemon_shark__Negaprion_brevirostris  common shallow-water schooling shark of the Atlantic from North Carolina to Brazil and off west Africa; dangerous
     subtype:  great_blue_shark__blue_shark__Prionace_glauca  slender cosmopolitan, pelagic shark; blue body shades to white belly; dangerous especially during maritime disasters
     subtype:  tiger_shark__Galeocerdo_cuvieri  large dangerous warm-water shark with striped or spotted body
     subtype:  soupfin_shark__soupfinshark__soupfin__Galeorhinus_zyopterus  Pacific shark valued for its fins (used by Chinese in soup) and liver (rich in vitamin A)
  subtype:  dogfish  any of several small sharks
     subtype:  smooth_dogfish  small bottom-dwelling shark found along both Atlantic coasts
        subtype:  smoothhound_shark__smoothhoundshark__smoothhound__Mustelus_mustelus  smooth dogfish of European coastal waters
        subtype:  American_smooth_dogfish__Mustelus_canis  found along the Atlantic coast of the Americas
        subtype:  Florida_smoothhound__Mustelus_norrisi  found from the northern Gulf of Mexico to Brazil
        subtype:  reef_whitetip_shark__whitetip_shark__Triaenodon_obseus  smooth dogfish of Pacific and Indian oceans and Red Sea having white-tipped dorsal and caudal fins
     subtype:  spiny_dogfish__spinydogfish  small bottom-dwelling dogfishes
        subtype:  Atlantic_spiny_dogfish__Squalus_acanthias  destructive dogfish of American and European Atlantic coastal waters; widely used in anatomy classes
        subtype:  Pacific_spiny_dogfish__Squalus_suckleyi  dogfish of Pacific coast of North America
  subtype:  hammerhead_shark__hammerhead  medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous
     subtype:  smooth_hammerhead__Sphyrna_zygaena  fished for the hides and vitamin-rich liver
     subtype:  smalleye_hammerhead__Sphyrna_tudes  fished for the hide and vitamin-rich liver
     subtype:  shovelhead__bonnethead__bonnet_shark__Sphyrna_tiburo  small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries
  subtype:  angel_shark__angelshark__angelfish__Squatina_squatina__monkfish  sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do

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