#family_Triakidae__Triakidae  small smooth-skinned sharks lacking spines on dorsal fins
  supertype:  #fish_family  any of various families of fish
  member of:  #subclass_Elasmobranchii
  member:  #genus_Mustelus__Mustelus  smooth dogfishes
     member:  #American_smooth_dogfish__Mustelus_canis  found along the Atlantic coast of the Americas
     member:  #Florida_smoothhound__Mustelus_norrisi  found from the northern Gulf of Mexico to Brazil
  member:  #smooth_dogfish  small bottom-dwelling shark found along both Atlantic coasts
  member:  #genus_Triaenodon__Triaenodon  a genus of Triakidae
     member:  #reef_whitetip_shark__whitetip_shark__Triaenodon_obseus  smooth dogfish of Pacific and Indian oceans and Red Sea having white-tipped dorsal and caudal fins

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