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 |
---|---|
Outermost cusp of both mandibles serrate | Outermost cusp of both mandibles unserrated, or with indistinct serrations on left mandible only |
Mesal tufts of silky setae on occiput | Occiput without mesal tuft of silky setae |
Abdominal segments 1–2 divided by pleural fold | Abdominal segments 1–3 divided by pleural fold |
Western North America (the range maps below are off, because they also include compacta) | Western North America and higher latitudes of Eastern North America |
3 Example Specimens | |
Skwala | Skwala Species Skwala compacta |