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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

The Tanana River in Alaska

Stream photos

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Female Skwala (Large Springfly) Stonefly AdultFemale Skwala (Large Springfly) Stonefly Adult
Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington
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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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  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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