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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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

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

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

Unlike other Nemourids, Prostoia nymphs are absent cervical gills.
Best regards,
Roger Rohrbeck
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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