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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Anteronotal protuberance (ANp) of mesothorax conical with distinctly pointed apex (sf 13.256) or subconical with a slightly rounded apex | Anteronotal protuberance (ANp) of mesothorax not distinctly conical or subconical, being instead often rounded and not projecting dorsally |
Hind wings present or absent, but if present, then without a costal projection | Hind wings, when present, with or without a costal projection |
Remaining genera: Acentrella, Heterocloeon, and Iswaeon | Remaining genera: Acerpenna, Americabaetis, Apobaetis, Baetis, Baetodes, Cloeodes, Diphetor, Fallceon, Labiobaetis, Moribaetis, Paracloeodes, and Plauditus |
4 Example Specimens | 5 Example Specimens |
Go to Couplet 9 | Go to Couplet 11 |