Order Ephemeroptera Hyatt and Arms 1890 (mayfly)
Invalid subtaxa: Aphelophlebia Pierce 1945, Costalimella nordestina Martins-Neto 1996 [nomen dubium], Costalimella zuechii Zamboni 2001 [nomen dubium], Plectoptera Packard 1886, Protephemeroidea Handlirsch 1906
Parent taxon: Heptabranchia according to A. H. Staniczek et al. 2011
Sister taxa: Coxoplectoptera, Cretereisma
Subtaxa: Aenigmephemeridae, Aphelophlebodidae, Babidae, Caenoephemera, Caenoidea, Doteridae, Durlophlebia, Dyadentomum, Epeoromimidae, Ephemeroidea, Euplectoptera, Heptagenioidea, Mesephemeridae, Palingeniidae, Palingeniopsidae, Phthartus, Sharephemeridae, Sinoephemera, Thnetus
Ecology: