This list of the mayflies recorded in the British Isles follows Macadam,[1] with nomenclature and taxonomy according to Kluge.[2] There are 51 species of mayfly known to occur in the British Isles , distributed among ten families .
Ameletidae Ameletus inopinatus Eaton, 1887 Arthropleidae Baetidae Alainites muticus (Linnaeus, 1758)
Baetis buceratus Eaton, 1870
Baetis fuscatus (Linnaeus, 1761)
Baetis rhodani (Pictet, 1843)
Baetis scambus Eaton, 1870
Baetis vernus Curtis, 1834
Centroptilum luteolum (Muller, 1776)
Cloeon dipterum (Linnaeus, 1761)
Cloeon simile Eaton, 1870
Labiobaetis atrebatinus (Eaton, 1870)
Nigrobaetis digitatus (Bengtsson, 1919)
Nigrobaetis niger (Linnaeus, 1761)
Procloeon bifidum (Bengtsson, 1912)
Procloeon pennulatum (Eaton, 1870) Caenidae Caenis horaria Brachycercus harrisella Curtis, 1834
Caenis beskidensis Sowa, 1973
Caenis horaria (Linnaeus, 1758)
Caenis luctuosa (Burmeister, 1839)
Caenis macrura Stephens, 1835
Caenis pseudorivulorum Keffermüller, 1960
Caenis pusilla Navás, 1913
Caenis rivulorum Eaton, 1884
Caenis robusta Eaton, 1884 Ephemeridae Ephemerellidae Seratella ignita (Poda, 1761)
Ephemerella notata Eaton, 1887 Heptageniidae Rhithrogena germanica Ecdyonurus dispar (Curtis, 1834)
Ecdyonurus insignis (Eaton, 1870)
Ecdyonurus torrentis Kimmins, 1942
Ecdyonurus venosus (Fabricius, 1775)
Electrogena affinis (Eaton, 1870)
Electrogena lateralis (Curtis, 1834)
Heptagenia longicauda (Stephens, 1835)
Heptagenia sulphurea (Müller, 1764)
Kageronia fuscogrisea (Retzius, 1783)
Rhithrogena germanica Eaton, 1870
Rhithrogena semicolorata (Curtis, 1834) Leptophlebiidae Potamanthidae Siphlonuridae