#family_Lamnidae__Lamnidae  oceanic sharks
  supertype:  fish_family  any of various families of fish
  member of:  subclass_Elasmobranchii
  member:  mackerel_shark  fierce pelagic and oceanic sharks
  member:  genus_Lamna__Lamna  a genus of Lamnidae
     member:  porbeagle__Lamna_nasus  voracious pointed-nose shark of northern Atlantic and Pacific
  member:  genus_Carcharodon__Carcharodon  man-eating sharks
     member:  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
  member:  genus_Cetorhinus__Cetorhinus  comprising only the basking sharks; in some classifications considered the type genus of a separate family Cetorhinidae
     member:  basking_shark__baskingshark__Cetorhinus_maximus  large harmless plankton-eating northern shark; often swims slowly or floats at the sea surface

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