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
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
Ephemeridae
Ephemerellidae
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