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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

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.

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Mayfly Genus Neoephemera

To my knowledge, nothing has been written in the angling literature about this rare genus of relatively large mayflies.

Where & when

Neoephemera seems to be most common in the Southeast, although there are scattered distribution records across parts of the Midwest and Northeast. The one specimen on this site hatched in mid-late May.

In 3 records from GBIF, adults of this genus have been collected during June (67%) and May (33%).

In 9 records from GBIF, this genus has been collected at elevations ranging from 1220 to 2546 ft, with an average (median) of 2188 ft.

Genus Range

Nymph biology

Neoephemera mayfly nymphs look like overgrown Caenis nymphs, with the characteristic operculate gills protecting their other gills from silt.

Specimens of the Mayfly Genus Neoephemera

1 Nymph

Start a Discussion of Neoephemera

References

Mayfly Genus Neoephemera

Taxonomy
Species in Neoephemera: Neoephemera bicolor, Neoephemera purpurea
2 species (Neoephemera compressa and Neoephemera youngi) aren't included.
Genus Range
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