Baetidae

Acentrella nadineae. 07/28/2005. Little Yellow Cr., 40.6196, -80.6771, J Freda.
Baetis flavistriga. 08/09/2010. Sandy Cr., 40.735146, -80.95773, D Eicher.
Baetis intercalaris. 08/23/2010. Middle Br. Sandy Cr., 40.751572, -81.06938, D Eicher.
Labiobaetis frondalis. 08/10/2010. Muddy Fork, 40.699749, -81.02198, D Eicher.
Labiobaetis propinquus. 08/10/2010. Sandy Cr., 40.744433, -81.08156, D Eicher.

Ephemerellidae

Eurylophella verisimilis. 1985. Little Beaver Cr., Hall (1985).
Ephemerella needhami. 1985. Little Beaver Cr., Hall (1985).
Ephemerella excrucians. 1985. Little Beaver Cr., Hall (1985).

Ephemeridae

Hexagena bilineata. 08/02/2010. Sandy Cr., 40.7494, -81.045, C McKnight.

Heptageniidae

Stenonema exigiuum*. 1985. (Little Beaver Cr., Hall (1985).
Stenonema femoratum. N. Fork Yellow Cr., U.S. Nat'l. Museum.
Stenonema mediopunctatum*. 06/17/2010. Conser Run, 40.7575, -81.0303, D Eicher.
Stenonema pulchellum*. 08/10/2010. Sandy Cr., 40.744433, -81.08156, D Eicher.
* This species is listed as Maccaffertium by Mayfly Central.

Isonychiidae

Isonychia bicolor. 1998. Little Beaver Cr., OEPA.
Isonychia rufa. 1985. Little Beaver Cr., Hall (1985)

Leptohyphidae

Tricorythodes allectus. 06/16/2010. Middle Br., Sandy Cr., 40.796792, -81.06981, D Eicher.