[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
   Order Squaliformes Compagno, 1973 - dogfish sharks
     Family Squalidae Blainville, 1816 - dogfish sharks
       Genus Isistius Gill, 1865
         1 Isistius brasiliensisᵀ (Quoy & Gaimard, 1824) - cookie cutter shark
         2 Isistius plutodus Garrick & Springer, 1964 - largetooth cookiecutter shark