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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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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.

Orvis4wt
Colorado

Posts: 3
Orvis4wt on Apr 25, 2007April 25th, 2007, 7:11 am EDT
Could someone recomend a good entomology book.. thanks
orvis4wt
Troutnut
Troutnut's profile picture
Administrator
Bellevue, WA

Posts: 2758
Troutnut on Apr 25, 2007April 25th, 2007, 7:56 am EDT
Caddisflies, Selective Trout, and Hatches II are good places to start. Beyond that, you'd have to give more detail about what you're looking for.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Apr 25, 2007April 25th, 2007, 12:18 pm EDT
Jeff-

Perhaps you would find Entomology Bookshelf, an article I wrote for Hatches Magazine, will help you to compare them.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Orvis4wt
Colorado

Posts: 3
Orvis4wt on Apr 26, 2007April 26th, 2007, 3:46 am EDT
Thanks for the info, I have been tying for many years and have wanted to start learning more when I'm turning over rocks so that I can determine what bugs are what. So any kind of information would work. thanks again.. this is a great site to learn from to..
orvis4wt
Konchu
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Site Editor
Indiana

Posts: 498
Konchu on Apr 26, 2007April 26th, 2007, 5:37 am EDT
It's a little out of date (1981), but Aquatic Entomology, by W. P. McCafferty, has some excellent pictures and an easy-to-use key to families.
Lheffner
JOHNSON CITY TN

Posts: 2
Lheffner on Apr 27, 2007April 27th, 2007, 6:38 am EDT
"NATURALS" COVERS IT ALL PRETTY GOOD, NOT A LOT OF PRETTY PICTURES, JUST GOOD ENTOMOLOGY.
LHEFFNER

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