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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Antennae situated approximately midway between anterior margin of head capsule and eyes | Antennae situated at or near anterior margin of head capsule (sf 19.74) |
Prosternal horn typically present, although sometimes short | Prosternal horn absent (sf 19.72) |
Chloride epithelia typically present on at least some abdominal segments | Chloride epithelia absent (sf 19.72) |
Remaining families: Apataniidae, Limnephilidae, Rossianidae, Thremmatidae, and Uenoidae | Remaining families: Beraeidae, Molannidae, Odontoceridae, and Sericostomatidae |
5 Example Specimens | 2 Example Specimens |
Go to Couplet 20 | Go to Couplet 24 |