#dogfish  any of several small sharks
  supertype:  shark  any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
  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

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