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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Small species with forewing length 2.5-4.5 mm | Larger species with forewing length greater than 4.0 mm |
Terminal segment of male forceps at least twice as long as wide | Terminal segment of male forceps not elongate, about equally wide and long |
Male genitalia without small rectangular plate between forceps bases | Male genitalia usually with small rectangular plate between forceps bases |
Remaining genera: Americabaetis and Paracloeodes | Remaining genera: Baetis, Cloeodes, and Plauditus |
5 Example Specimens | |
Go to Couplet 20 | Go to Couplet 21 |