Chordata Bateson, 1885 - chordates
Count: -
   Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838
  Count: [f†f] 7o;39f;5g; †4o;22f;4g
     Subclass Selachii see Division Selachii
    Count: [f†f] 6o;36f;4g; †4o;19f;4g
       Order Notidani Jaekel, 1911 [monotypic] see Order Hexanchiformes Compagno, 1973
      Count: [f] 1f
         1 Suborder Opistharthri [monotypic] see Order Hexanchiformes Compagno, 1973
        Count: [f] 1f