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Mayfly Species Paraleptophlebia packii (Mahogany Dun)

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 (Morphology: The form and structure of an organism, or the study of the form and structure of organisms.), 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

Region: West

Time Of Year (?): Fall

Hatching Behavior

Time Of Day (?): Late morning through evening

Habitat: Slow pools

Spinner Behavior

Ernest Schwiebert reports in Matching the Hatch that the spinners return four days after emerging as duns.

Nymph Biology

Current Speed: Slow water

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