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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Stigmatic area of forewings divided by a thin, approximately straight vein into two series of small cells (source fig 13.215) | Stigmatic area with either simple crossveins or anastomosed crossveins divided by a more irregular vein into two series of small cells, but not as at left (source fig 13.216) |
Remaining families: Arthropleidae and Heptageniidae | |
3 Example Specimens | 5 Example Specimens |
Heptageniidae Genus Cinygma | Go to Couplet 22 |