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.

A small, old rock wing dam has created an excellent riffle and pool in this classic trout stream.

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

11 Recently Added Photos

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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Acroneuria abnormis (Golden Stone) Stonefly Nymph Pictures

Ruler view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Paradise Creek in Pennsylvania The smallest ruler marks are 1 mm.

Ventral view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Paradise Creek in Pennsylvania

Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Paradise Creek in Pennsylvania

Dorsal view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Paradise Creek in Pennsylvania

Lateral view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Paradise Creek in Pennsylvania

Perlid stonefly nymph. A stonefly nymph crawls along the river rocks

Artistic view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Paradise Creek in Pennsylvania

This stonefly was collected from Paradise Creek in Pennsylvania on May 29th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Nymph

Hate to do this again....

5 replies

Posted by PeterO on Jun 6, 2007

Last reply on Oct 1, 2010 by GONZO

Jason-

This is actually a specimen of Acroneuria abnormis. Paragnetina species have a complete set of spinules/setae on the occiput, which this guy is lacking. On a semi-related subject, could you forward me the collection data for the Arcynopteryx paralella you got from the Catskills? Thanks a bunch.

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