living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
               Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
                 Cohort Euselachii Hay, 1902 - spined sharks and relatives see Infraclass Euselachii Hay, 1902
                   Subcohort Neoselachii Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
                     Superorder Squalomorphii (Compagno, 1973) see Division Squalea (Shirai, 1996)
                       Order Squaliformes Compagno, 1973 - dogfish sharks
                         Family Squalidae Blainville, 1816 - dogfish sharks
                           1 Genus Squalus Linnaeus, 1758 - spiny dogfishes
                           2 Genus Isistius Gill, 1865
                           3 Genus Deania Jordan & Snyder, 1902 - longnose dogfish
                           4 Genus Centroscymnus Bocage & Capello, 1864 - velvet dogfishes
                           5 Genus Somniosus Lesueur, 1818