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.

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington

I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.

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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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stonefly ?

Sandfly has attached this picture to aid in identification. The message is below.

Sandfly
tioga co. pa.

Posts: 33

Sandfly on Jan 7, 2009January 7th, 2009, 12:35 pm EST

not sure if this is a stone or not. Any help..

sandfly
shop owner
N.J.B.B.A. #2215
Tiadaughton T.U. 688
I didn't Escape------They gave me a day pass !

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Jan 8, 2009January 8th, 2009, 2:13 am EST

Bob-

That is a strange one. Wish your photo had better definition. Doesn't look like a stonefly nymph to me. With the truncate (or perhaps vertical) head, and quite widely separated thoracic segment plates, it really doesn't look exactly like any aquatic insect immature I recall seeing. How long was it? Was it clinging to the underside of a submerged rock?

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Sandfly
tioga co. pa.

Posts: 33

Sandfly on Jan 8, 2009January 8th, 2009, 8:09 am EST

yes under a rock with a few other stone flys. hopin to find more this year.sorry only pic i had with a 4meg camera have a 7 meg this year.

sandfly
shop owner
N.J.B.B.A. #2215
Tiadaughton T.U. 688
I didn't Escape------They gave me a day pass !