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

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

Silver Creek in Idaho

Stream photos

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Skwala (Large Springfly) Stonefly NymphSkwala (Large Springfly) Stonefly Nymph
Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
6 Recently Added Photos
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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  3. Cervical gills

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  2. Specimen Discussion
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  3. Cervical gills

Prostoia (Tiny Winter Black) Stonefly Nymph
6 Pictures
Dorsal view of a Prostoia (Nemouridae) (Tiny Winter Black) Stonefly Nymph from Salmon Creek in New York
Added by Troutnut on April 7, 2006
Collected March 28, 2006 from Salmon Creek in New York and added by Troutnut on April 7, 2006
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Cteas
Posts: 1
Cteas on Feb 21, 2009February 21st, 2009, 7:44 am EST
Where are the cervical gills on this specimen?
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 21, 2009February 21st, 2009, 3:22 pm EST
Cteas-

Unlike other Nemourids, Prostoia nymphs are absent cervical gills.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Lbrize
West Virginia, U.S.A.

Posts: 1
Lbrize on Feb 21, 2012February 21st, 2012, 7:40 am EST
Prostoia do not have cervical gills. Likely you are thinking about Amphinemura, very common and with cervical gills.
Society for Freshwater Science (Formerly NABS) EPT East Genus Certified Taxonomist

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