[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
Count: [*] 8o;30f;98g;344s
   Order Hexanchiformes Compagno, 1973 - six-gill sharks
  Count: [*] 2f;4g;5s
     Order Hexanchiformes Compagno, 1973 - six-gill sharks
    Count: [*] 2f;4g;5s
       Family Hexanchidae Gray, 1851 - cow sharks
      Count: [*] 3g;4s
         Family Hexanchidae Gray, 1851 - cow sharks
        Count: [*] 3g;4s
           Genus Heptranchias Rafinesque, 1810 [monotypic]
          Count: [*] 1s
             Genus Heptranchias Rafinesque, 1810 [monotypic]
            Count: [*] 1s
               1 Heptranchias perloᵀ (Bonnaterre, 1788) - sevengilled shark
              Count: -