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)