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> > Mayfly nymph ID help.

Quagmireage has attached these 4 pictures to aid in identification. The message is below.
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QuagmireageApril 10th, 2015, 2:44 pm
Somerset, PA

Posts: 2
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.
MillcreekApril 10th, 2015, 3:20 pm
Healdsburg, CA

Posts: 293
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
WbranchApril 10th, 2015, 4:24 pm
York & Starlight PA

Posts: 2119
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.
EntomanApril 10th, 2015, 9:03 pm
Site Editor
Northern CA & ID

Posts: 2604
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
LastchanceApril 11th, 2015, 9:58 am
Portage, PA

Posts: 435
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
QuagmireageApril 11th, 2015, 6:44 pm
Somerset, PA

Posts: 2
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!

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