Synonyms: Aphelophlebia Pierce 1945, Plectoptera Packard 1886, Protephemeroidea Handlirsch 1906, Protephemeroptera Handlirsch 1906, Triangulifera Willmann 2007
Parent taxon: Heptabranchia according to P. Sroka and A. H. Staniczek 2022
See also Bechly 2007, Carpenter 1992, Demoulin 1956, Demoulin 1962, Grimaldi and Engel 2005, Handlirsch 1906, Haughton 1924, Hong 1984, Huang et al. 2011, Martynov 1932, Sroka et al. 2014, Staniczek et al. 2011 and Willmann 2007
Sister taxa: Coxoplectoptera, Cretereisma
Subtaxa: Aenigmephemeridae Alulata Aphelophlebodidae Babidae Clephemera Costalimella nordestina Durlophlebia Epeoromimidae Ephemera oeningensis Euplectoptera Heptagenioidea Hexagenitidae Libanoephemera Metretopus henningseni Parabaetis Protereismidae Schistonota Triplosobidae Turfanerella
Ecology: