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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1 long sclerite at posterior edge of base of each lateral hump of abdominal segment I (sf 19.281, 19.284) | 2 or more sclerites at base of each lateral hump on abdominal segment I (sf 19.283, 19.285) |
Remaining genera: Homophylax, Hydatophylax, and Pycnopsyche | Remaining genera: Chilostigma, Clostoeca, Desmona, Grensia, Monophylax, and Psychoglypha |
3 Example Specimens | 1 Example SpecimenThis one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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Go to Couplet 8 | Go to Couplet 10 |