#smooth_dogfish  small bottom-dwelling shark found along both Atlantic coasts
  supertype:  dogfish  any of several small sharks
  member of:  family_Triakidae
  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

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