Kingdom [Animalia] Linnaeus, 1758 - animals
   Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval. - ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997 [Lake, Halanych, Servin & Garey 2020]
     Panarthropoda Nielsen, 1995 - panarthropods
       Tritocerebra see [unranked] Tactopoda Budd, 2001
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Mandibulata Snodgrass, 1938
             Infraphylum Atelocerata see [unranked] Mandibulata
               Superclass Panhexapoda
                 Epiclass Hexapoda Latreille, 1825 see Superclass Hexapoda Latreille, 1825
                   Class Insecta Linnaeus, 1758 - insects
                     Dicondylia Haeckel, 1866 see Subclass Dicondylia Haeckel, 1866
                       Pterygota Lang, 1888 see Infraclass Pterygota Lang, 1888
                         Order Ephemeroptera Hyatt & Arms, 1891 - mayflies
                           Suborder Furcatergalia Kluge, 1998
                             1.1 Superfamily Leptophlebioidea Banks, 1900 see Infraorder Lanceolata
                             1.2.1 ?Family †Torephemeridae Sinitshenkova, 1989
                             1.2.2 Superfamily Behningioidea Motas & Bacesco, 1937 see Infraorder Palpotarsa
                             1.3 Superfamily Ephemeroidea Latreille, 1810
                             2.1 Superfamily Caenoidea Newman, 1853
                             2.2.1 Family †Mesonetidae (Tshernova, 1969)
                             2.2.2 Superfamily Ephemerelloidea Klapalek, 1909