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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 Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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.

Dryfly has attached this picture to aid in identification. The message is below.
rochester mn

Posts: 133
Dryfly on Mar 19, 2007March 19th, 2007, 1:39 pm EDT
gonzo heres the caddis without the case
without the case it is a bit smaller about 1.5 cm
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Mar 19, 2007March 19th, 2007, 2:13 pm EDT
If you've still got it, could you take a pic with it in the water, under a bright light but without the flash? Getting in closer if possible would also help a lot.

It's really hard to make out the important details of nymphs or larvae out of the water. Caddis larvae look as strange dry as a cat does soaking wet.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
rochester mn

Posts: 133
Dryfly on Mar 19, 2007March 19th, 2007, 2:58 pm EDT
troutnut i'll try that
thanks for the tip
rochester mn

Posts: 133
Dryfly on Mar 20, 2007March 20th, 2007, 1:31 pm EDT
couldn't get a good enough picture oh well
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Mar 20, 2007March 20th, 2007, 2:55 pm EDT
Nice try, anyway. You did a fine job of extracting the little bugger from its case without damage.

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