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 Triakidae Gray, 1851 - houndsharks
                           1 Genus Furgaleus Whitley, 1951
                           2 Genus Galeorhinus Blainville, 1816
                           3 Genus Gogolia L.J.V. Compagno, 1973
                           4 Genus Hemitriakis Herre, 1923
                           5 Genus Hypogaleus Smith, 1957
                           6 Genus Iago Compagno & Springer, 1971
                           7 Genus Mustelus Linck, 1790 - smoothhounds
                           8 Genus Scylliogaleus Boulenger, 1902
                           9 Genus Triakis Müller & Henle, 1838