European mayfly families with approximate number of species (data from freshwaterecology.info)

  • Ametropodidae (4)
  • Prosopistomatidae (1)
  • Potamanthidae (1)
  • Polymitarcyidae (2)
  • Palingeniidae (3)
  • Oligoneuriidae (8)
  • Neoephemeridae (1)
  • Leptophlebiidae (38)
  • Isonychiidae (1)
  • Heptageniidae (145)
  • Ephemeridae (7)
  • Ephemerellidae (15)
  • Caenidae (18)
  • Behningiidae (1)
  • Baetidae (82)
  • Arthropleidae (1)
  • Ameletidae (2)
  • Siphlonuridae (14)