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 |
---|---|
Occipital area with a pair of pale oval markings adjacent to compound eyes; posterior margins of ovals marked by dense irregular rows of short, thick setae (sf 16.173) | Occipital area without pale oval markings margined by short, thick setae |
Western North America and higher latitudes of Eastern North America | Widely distributed |
5 Example Specimens | |
Diura | Isoperla |