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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Postocular fringe reduced to 1-3 long setae (sf 16.107) | Postocular fringe with a close-set row of several thick spinules |
Pronotal fringe of 2-3 setae at corners | Pronotal fringe well developed, consisting of a close-set row of spinules or setae, occasionally incomplete laterally |
Eyes set forward on head | |
Remaining genera: Hansonoperla and Perlinella | Remaining genera: Acroneuria, Anacroneuria, Beloneuria, and Eccoptura |
5 Example Specimens | |
Go to Couplet 11 | Go to Couplet 12 |