wondering what fly this is (south western pennsylvania) guessing some species of mayfly but wondering which specifically. thanks! Posted by 24k_1128
Photon_Chaser on April 6, 2026 10:01 pm Mayfly (Heptageniidae) Nymph The āflatheadā suggests this may be Epeorus vitreus
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Mayfly (Heptageniidae) Nymph
The āflatheadā suggests this may be Epeorus vitreus
Looks fairly large. Could be a March brown.
*Stenacron* spp. or *Stenonema* spp.
Pheasant tail, preferably with a black bead head
Iād say stenonema. Thatās a March brown nymph.