This large western species is common in places. It is one of the few that has tusks and substitutes for the more common tusked Paraleptophlebia bicornuta in some locales, particularly the central Rockies in parts of Colorado, Utah, and Wyoming where they have been documented. Telling the tusked species apart is very difficult and even entomological texts are largely ambiguous on the characters that differentiate the nymphs. Angling texts relying on gill morphology, terga pattern, and tusk shape are dubious at best. For now, the angler's best bet is to rely somewhat on documented distribution.
Where & when
Time of year : Fall
Time of day : Late morning through evening
Ernest Schwiebert reports in Matching the Hatch that the spinners return four days after emerging as duns.
Current speed: Slow water
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Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.