After Kazlev, 2003, and Grimaldi & Engel, 2005

Recent mayflies after Parker, 1982

<==o Ephemeroptera sensu lato (mayflies; päivänkorennot)
   |?- †Triplosoba pulchella Brongniart, 1893; U.Carb. WEu. [Protephemeroptera Handlisch 1906: †Triplosobidae] [possibly basal metapterygotes (Grimaldi & Engel, 2005)]
   `--o Ephemeroptera sensu stricto (mayflies; päivänkorennot)
      |--o †Synthonopterodea [paraphyletic?]
      |  |--o †Bojophlebiidae [Moscovian]
      |  |  `-- †Bojophlebia prokopi
      |  `--o †Syntonopteridae
      |     `-- †Lithoneura lameerei
      `--o Plectoptera sensu Tillyard [Euephemeroptera sensu Julievich et al.]
         |==o †Proterismatoidea [paraphyletic †Permoplectoptera]
         |  |--o †Protereismatidae Lameere, 1917 [Protereismopheridae Sellards 1907] [Asselian? – Kungurian?]
         |  |  `--o †Protereisma Sellards, 1907 [Protechma; Prodromus; Bantiska; Pinctodia; Rekter Sellards, 1907; Esca; Mecus Sellards 1909; Loxophlebia Martynov, 1928
         |  |     |-- †P. arcuatum (Sellards, 1907) [Rekter]
         |  |     |-- †P. latum Sellards, 1907
         |  |     |-- †P. directum Carpenter, 1979
         |  |     |-- †P. americanum (Demoulin, 1970) (Kukalova)
         |  |     `-- †P. permianum
         |  |--o †Misthodotidae Tillyard 1932 [Asselian? – Kungurian?]
         |  |  `--o Misthodotes Sellards, 1909 [nom. subst. pro Dromeus Sellards, 1907;= Eudoter Tillyard, 1936]
         |  |     |-- M. obtusus (Sellards, 1909) [Dromeus]
         |  |     |-- M. edmundsi Carpenter, 1979
         |  |     `-- M. ovalis Tillyard, 1932
         |  |-- †Jarmilidae [Asselian? – Kungurian?]
         |  |-- †Oboriphlebiidae [Asselian? – Kungurian?]
         |  `-- †Palingeniopsidae [Permian] [paraphyletic †Permoplectoptera]
         `--+?- ††Thuringopteryx gimmi Kühn, 1937 [L. Trias. WEu.] [paraphyletic †Permoplectoptera] [has been treated as Spilapterid by “The Tree of Life”]
            |-- †Litophlebiidae [paraphyletic †Permoplectoptera]
            |--o †Mesoplectopteridae [paraphyletic †Permoplectoptera]
            |  `-- †Mesoplectopteron
            |--o †Mesephemeroidea [paraphyletic †Permoplectoptera]
            |  `-- †Mesephemeridae [Ufimian?/Tartarian – Tithonian]
            `--+?- †Tintoriniidae [paraphyletic †Permoplectoptera]
               `--o Euplectoptera [Euephemeroptera] (Recent mayflies; nykypäivänkorennot)
                  |--o Carapacea
                  |  `--o Baetiscoidea [Baetoidea]
                  |     |--o Baetidae [Priabonian – Recent]
                  |     |  |-- Acentrella
                  |     |  |-- Baetis
                  |     |  |-- Baetopus
                  |     |  |-- Centroptilum
                  |     |  |-- Cloeon
                  |     |  |-- Procloeon
                  |     |  `-- Pseudocentroptiloides
                  |     |-- Oniscigastridae [Recent]
                  |     |-- Ameletopsidae [Recent]
                  |     `-- Ametropodidae [Aptian – Recent]
                  |--o Pisciformia
                  |  |--o Siphonuroidea
                  |  |  `-- Siphlonuridae [Hettangian?/Toarcian – Recent]
                  |  `--+?- †Epeoromimidae [Hettangian?/Toarcian – Berriasian?/Albian]
                  |     `--+?- †Aenigmephemeridae [Aenigephemeridae lapsus calami] [?Oxfordian/?Portlandian]
                  |        `--o Heptagenioidea
                  |           |-- Coloburiscidae [Recent]
                  |           |-- Oligoneuriidae [Aptian – Recent]
                  |           |-- Isonychiidae [Recent] 
                  |           `-- Heptageniidae [Priabonian – Recent]
                  `--o Furcatergalia
                     |--o Pannota
                     |  |--o Caenoidea
                     |  |  |-- Neoephemeridae [Rupellian?/Chattian – Recent]
                     |  |  |-- Baetiscidae [Recent]
                     |  |  |-- Caenidae [Recent]
                     |  |  `-- Prosopistomatidae [Recent]
                     |  `--+-- †Mesonetidae
                     |     `--o Ephemerelloidea
                     |        |-- Ephemerellidae [Hettangian?/Toarcian – Recent]
                     |        |-- Leptohyphidae [Recent]
                     |        `-- Tricorythidae [Recent]
                     `--+--o Leptophlebioidea
                        |  `-- Leptophlebiidae [Hettangian?/Toarcian?Aptian – Recent]
                        |--+?- †Torephemeridae
                        |  `--o Behningioidea
                        |     `-- Behningiidae Tshernova, 1938 [Jurassic – Recent]
                        `--o Ephemeroidea
                           |?- †Palaeoanthidae [Santonian]
                           |--o Potamanthidae [Berriasian?/Albian – Recent]
                           |  `-- Potamanthus
                           |-- Euthyplociidae [Berriasian?/Albian – Recent]
                           |-- Polymitarcydae [Aptian – Recent]
                           |--o Ephemeridae [Aptian – Recent]
                           |  `-- Ephemera
                           `-- Palingeniidae [?Oxfordian/?Portlandian – Recent]


    †Ephemeropsis melanurusProtoligoneura limaiHexagenitidae [Hettangian?/Toarcian – Berriasian?/Albian]
    †Paedephemeridae  [Jurassic]

Reference(s):