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 Galeomorphii Compagno, 1973 see Division Galeomorphii Compagno, 1973
                       Order Carcharhiniformes Compagno, 1973 - ground sharks
                         Family Proscylliidae Fowler, 1941 - finback catsharks
                           1 Genus Ctenacis L.J.V. Compagno, 1973
                           2 Genus Eridacnis Smith, 1913
                           3 Genus Gollum L.J.V. Compagno, 1973
                           4 Genus Proscyllium Hilgendorf, 1904