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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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

Mayfly Genus Neoephemera

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