This is a small family (Taeniopterygidae) with just two genera, but fairly widespread in Ohio. Some species (e.g., Taeniopteryx burksi) are common in about half the counties (see Atlas). This family is distinguished by being found in winter, small and with wingpads swept out at a 45 degree angle. The two genera are distinguishable by the presence or absence of telescopic coxal gills (see Figure 1). Taniopteryx has them, Strophopteryx does not. The nymphs are found in fast water in December and the adults come out in January - February. They can provide a "hatch" that trout will rise to. Pictures of common Taeniopterygidae are below.
Taeniopteryx burksi (nymph)
Fig. 1. Telescopic gills
Taeniopteryx burksi (adult).
