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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Palaeoptera
                       [Paleoptera]
                    Ephemeroptera
                      Pisciforma
                            Metretopodidae
                                     Metretopus
                                             Metretopus alter
                                             Metretopus borealis
                                                   [Heptagenia borealis]
                                                   [Metretopus norvegicus]
                                                   [Rhithrogena borealis]
                                     Siphloplecton
                                             Siphloplecton basale
                                                   [Baetis basalis]
                                                   [Heptagenia basalis]
                                                   [Siphloplecton basalis]
                                                   [Siphloplecton flexus]
                                                   [Siphloplecton signatum]
                                                   [Siphlurus flexus]
                                             Siphloplecton brunneum
                                             Siphloplecton costalense
                                             Siphloplecton fuscum
                                             Siphloplecton interlineatum
                                                   [Baetis femorata]
                                                   [Baetis interlineata]
                                             Siphloplecton simile
                                             Siphloplecton speciosum