#requiem_shark__requiemshark  any of numerous sharks from small relatively harmless bottom-dwellers to large dangerous oceanic and coastal species
  supertype:  shark  any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
  member of:  family_Carcharhinidae
  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)

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