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.

Stream photos

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Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

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.

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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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florida mayfly nymph imitations

This topic is about the Mayfly Species Eurylophella temporalis

Example specimens

Homer47
Posts: 1

Homer47 on Sep 5, 2012September 5th, 2012, 5:06 pm EDT

Looks like an imitation would be about a #10 or #8 dark brown nymph pattern. I'm down here in north Fla and trying to match the hatch in the far north central part of the state, mostly to fool the bream. Any ideas or help would be appreciated. I found two patterns so far that seem to work- a little brown nymph with a rusty brown/orange thorax(maybe this is a good representation of the E. Temporalis), and a size 12 buzzer nymph with black body, peacock thorax and white breathing filament. The bream seemed to agree with that choice. I would like to try and copy more local insects as I figure out what they are.There are dragonflies and damselflies and mosquitoes. I could start there.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 5, 2012September 5th, 2012, 6:11 pm EDT

Hi Homer47-

Welcome to the forum, and congratulations on your first post. At 10-11 mm, mature Eurylophella temporalis nymph would be more like size #12. Good luck with your experimental development of patterns to attract Bream, and be sure to keep us posted.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Sayfu
Posts: 560

Sayfu on Sep 5, 2012September 5th, 2012, 10:12 pm EDT

I'm bettin a standard nymph shape such as a Hare's Ear with small diameter rubber legs does the trick on Bream.