Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Option 1 | Option 2 |
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Base of veins MP2 and CuA in forewings strongly divergent from base of vein MP1 | Base of veins MP2 and CuA in forewings not strongly divergent from base of vein MP1 |
Base of vein MP2 strongly bent toward CuA (source figs 13.165.13.168) and sometimes fused at base with CuA | Base of vein MP2 may only diverge from MP1 |
Fork of vein MP usually less symmetrical | Fork of vein MP usually more symmetrical (many source figs) |
Hind wings with numerous veins and crossveins | Hind wings may have numerous veins and crossveins, but are sometimes reduced or absent |
Vein MA of hind wings unforked (source figs 13.165-13.168) | If hind wings present, vein MA variable |
Remaining families: Ephemeridae, Euthyplociidae, Neoephemeridae, Palingeniidae, Polymitarcyidae, and Potamanthidae | Remaining families: Acanthametropodidae, Ameletidae, Ametropodidae, Arthropleidae, Baetidae, Baetiscidae, Caenidae, Ephemerellidae, Heptageniidae, Isonychiidae, Leptohyphidae, Leptophlebiidae, Metretopodidae, Pseudironidae, and Siphlonuridae |
5 Example Specimens | 5 Example Specimens |
Go to Couplet 4 | Go to Couplet 8 |