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 Arthropoda Siebold, 1848 - arthropods
           Subphylum Uniramia Snodgrass, 1935 see Phylum Arthropoda Siebold, 1848
             Class Insecta Linnaeus, 1758 - insects
               Subclass Pterygota Lang, 1888 - winged insects see Infraclass Pterygota Lang, 1888
                 Infraclass Paleoptera - ancient winged insects see Infraclass Pterygota Lang, 1888
                   Order Ephemeroptera Hyatt & Arms, 1891 - mayflies
                     Suborder Schistonota McCafferty & Edmunds, 1979
                       Superfamily Baetoidea Leach, 1815
                         1 Family Siphlonuridae Ulmer, 1920
                         2 Family Ametropodidae Bengtsson, 1913
                         3 Family Baetidae Leach, 1815
                         4 Family Metretopodidae Traver, in Needham et al., 1935
                         5 Family Oligoneuriidae Ulmer, 1914
                         6 Family Heptageniidae Needham, 1901