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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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their 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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Stone

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

Xavier_Carp
Posts: 13

Xavier_Carp on Dec 13, 2008December 13th, 2008, 3:24 pm EST

Hi guys, this is a stonefly that is very common in our rivers, but no clue of the genus or species, hope you can help me

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Dec 14, 2008December 14th, 2008, 12:28 pm EST

Xavier_Carp,

It looks similar to a stonefly species we have in WA, but I don't believe that genus is distributed beyond the NW coastal region of the US, so have asked Dr. Richard Baumann if he recognizes it. Will post his response when received.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Xavier_Carp
Posts: 13

Xavier_Carp on Dec 15, 2008December 15th, 2008, 12:51 am EST

Taxon, thanks alot, I'll wait for the post :)

Best regards

Xavier

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Dec 15, 2008December 15th, 2008, 10:49 am EST

Xavier-

Dr. Baumann's response:

The stonefly nymph is probably a member of the genus Anacroneuria. This is the most common genus in Mexico and Central America. It is in the family Perlidae.

My addition:

There appear to be only two North American species of this genus, and only one of them being present in Mexico (MX):

Anacroneuria lineata (Pickett), 1924) BE, HO, MX, NI, TX
Anacroneuria wipukupa Baumann and Olson, 1984 AZ

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Xavier_Carp
Posts: 13

Xavier_Carp on Dec 17, 2008December 17th, 2008, 12:51 am EST

Taxon, thank you very much!! that is great inforamtion

Thanks

xavier