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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Hind wings present | Hind wings present or absent |
Costal projections of hind wings present with broad bases (sf 13.213a,b) and acute apices | If hind wings present, costal projections present or absent, but if present, shape variable |
Anterior margins of hind wings from wing articulations to apices of costal projections straight, producing characteristic shape of hind wings (sf 13.213a,b) | If costal projections similar to at left with acute apices, then costal projections lack broad bases such that hind wings are not shaped as at left (sf 13.214a,b). Fallceon thermophilos seems to be the one critical exception, having hind wings with small acute costal projections and broad bases producing a slightly modified, or elevated, wing margin. However, the terminal segment of male forceps of this species is at least half as long as the preceding segment.) |
Found in medium to large rivers | |
Remaining genera: Acentrella, Acerpenna, Americabaetis, Apobaetis, Baetis, Baetodes, Cloeodes, Diphetor, Fallceon, Heterocloeon, Iswaeon, Labiobaetis, Moribaetis, Paracloeodes, and Plauditus | |
5 Example Specimens | |
Camelobaetidius | Go to Couplet 8 |