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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Epeorus albertae (Pink Lady) Mayfly Nymph Epeorus albertae (Pink Lady) Mayfly Nymph

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington

This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.

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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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Mayfly nymph ID help.

Quagmireage has attached these 4 pictures to aid in identification. The message is below.

Quagmireage
Somerset, PA

Posts: 4

Quagmireage on Apr 10, 2015April 10th, 2015, 10:44 am EDT

Here are a few pictures of a mayfly nymph (and a stonefly nymph) that I pulled from the Barronville section of Laurel Hill Creek in Somerset county PA.
At first I thought the mayfly nymph was a Hendrickson but now I'm not sure.
Any help in identifying it would be greatly appreciated.
Thanks.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Apr 10, 2015April 10th, 2015, 11:20 am EDT

Clark - Looks like a Maccaffertium. I can't go any further on the identification. Just not familiar enough with the genus. Here's a link to a nymph on Bugguide; http://bugguide.net/node/view/96319/bgimage

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Wbranch

York & Starlight PA

Posts: 2635

Wbranch on Apr 10, 2015April 10th, 2015, 12:24 pm EDT

Not a Hendrickson (Ep subvaria) for sure. I believe, as Millcreek has stated, it is a March Brown (Maccaffertium) nymph.

Catskill fly fisher for fifty-five years.

Entoman

Northern CA & ID

Posts: 2604

Entoman on Apr 10, 2015April 10th, 2015, 5:03 pm EDT

Welcome to the forum, Quag.

Normally you need a better look at the gills to determine genus let alone species in this heptageniid group. Luckily, the maculation on the anterior of ventral sternum seg. 9 is unmistakedly Maccaffertium vicarium (March Brown).

The stonefly is a perlid (Golden Stone) most likely of the Acroneuria genus. There isn't enough visual info to attempt a species ID (which is tenuous at best with this genus even if more detail was available).

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

Lastchance
Portage, PA

Posts: 437

Lastchance on Apr 11, 2015April 11th, 2015, 5:58 am EDT

Welcome to the forum, Quag.

Normally you need a better look at the gills to determine genus let alone species in this heptageniid group. Luckily, the maculation on the anterior of ventral sternum seg. 9 is unmistakedly Maccaffertium vicarium (March Brown).

The stonefly is a perlid (Golden Stone) most likely of the Acroneuria genus. There isn't enough visual info to attempt a species ID (which is tenuous at best with this genus even if more detail was available).

Thanks for adding the common name. It saves me from looking it up, although I'm getting better at remembering.
Bruce

Quagmireage
Somerset, PA

Posts: 4

Quagmireage on Apr 11, 2015April 11th, 2015, 2:44 pm EDT

Thanks everyone for the info! This was my first attempt at stream side entomology and it's great to have this resource to turn to!