| Family | Austremerellidae
McCafferty & Wang, 2000
| 0
0 | Genera
Species |
| Family | Coryphoridae
Molineri, Peters & Zuñiga de Cardoso, 2001 ⇒ Machadorythinae
| 0
0 | Genera
Species |
| Family | Dicercomyzidae
Edmunds & Traver, 1954 ⇒ Dicercomyzinae
| 0
0 | Genera
Species |
| Family | Ephemerellidae
Klapálek, 1909 ⇒ Teloganodidae
Blue-Winged Olive Ephemerellidae, Spiny Crawler Mayflies | 64
587 | Genera
Species |
| Family | Ephemerythidae
McCafferty & Wang, 2000 ⇒ Ephemerythinae
| 1
0 | Genus
Species |
| Family | Leptohyphidae
Landa & Soldán, 1985
Little Stout Crawler Mayflies | 27
280 | Genera
Species |
| Family | Machadorythidae
McCafferty & Wang, 2000 ⇒ Machadorythinae
| 0
0 | Genera
Species |
| Family | Melanemerellidae
Demoulin, 1955 ⇒ Melanemerellinae
| 0
0 | Genera
Species |
| Family | Teloganellidae
McCafferty & Wang, 2000 ⇒ Teloganodinae
| 0
0 | Genera
Species |
| Family | Teloganodidae
Allen, 1965 ⇒ Ephemerellidae
| 0
0 | Genera
Species |
| Family | Tricorythidae
Lestage, 1942
Little stout crawler mayflies | 12
71 | Genera
Species |
| Family | Vietnamellidae
Allen, 1984
| 1
2 | Genus
Species |
