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Photo#1636506
Leucrocuta

Leucrocuta
Missoula, Missoula County, Montana, USA
Size: ~13mm
I found this a number of years ago in a small stream -- Grant Creek -- in Montana. At first I thought it was genus Nixe, but Nixe apparently doesn't occur in Montana. Any help on the species?

Moved
Moved from Mayflies.

Heptageniidae
Hi Robert-

To the best of my knowledge, neither Nixe nor Leucrocuta are found in Montana, so I will place this image in the guide at family level, and will frass the duplicate image you placed in Nixe.

Moved
Moved from ID Request.

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