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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Metanotal sa1 and sa2 distinct, separated by gaps free of setae. (sf 19.293, 19.294) | Metanotal sa1 and sa2 connected by contiguous longitudinal band of setae on each side of meson (sf 19.291) |
Remaining genera: Chilostigma, Clostoeca, and Grensia | Remaining genera: Ecclisocosmoecus and Pseudostenophylax |
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 15 | Go to Couplet 17 |