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Stonefly Nymph - Claassenia sabulosa

Stonefly Nymph - Claassenia sabulosa
Gallatin River, 3 miles south of Gallatin Gateway, Montana, Gallatin County, Montana, USA
August 8, 2010
Size: 1-1/4"
The Gallatin River above Gallation Gateway MT is a fast freestone river with
little visible silt, algae or aquatic plants. Nearly all typical aquatic
insects are present, including midges and cranefly (diptera), caddis, mayflies
and stoneflies. But the stoneflies predominate. The larger, darker, browner
(possibly Pteronarcys) stoneflies are the most common. This one, colloquially
referred to as a Golden Stonefly, is abundant, but definitely in the minority. What is it?
Perla something-or-other? There are lots of sculpins too, in this stretch.
But of course sulpins are not "bugs" (aquatic insects).

Moved from ID Request.

Claassenia sabulosa (Banks)
This is Claassenia sabulosa (Banks), a very common perlid stonefly found throughout the Rockies, up into Canada and can even be found here in California.

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