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> > Stonefly, very dark but what else can I find out?

The Specimen

Isoperla (Stripetails and Yellow Stones) Stonefly AdultIsoperla (Stripetails and Yellow Stones) Stonefly Adult View 14 PicturesA friend brought me this stonefly to photograph. He found it floating on the surface of a trout stream with its wings in a crippled position.
Collected May 5, 2006 from Salmon Creek in New York
Added to by on May 22, 2006

The Discussion

IanBMay 5th, 2009, 10:25 am
Posts: 3Ok all, I am finding this hobie increasingly interesting and exciting. I no longer will just be guessing on the river, but actually selecting flies that best represent the actual bugs I am finding.

Here is another one from yesterday's trip, there are many of these flying around as adult, some size 14, others down to size 18, I grabbed one of the larger ones (just pushing size 14) and got some better macro pictures.

Thanks for the help in identifying this 'small' stonefly (that is my identification at this point anyway). Taken May 4th 2009 in the North Shore of Mass.

I apologize, but although I have re-sized these pictures (way down in some cases) I can not get them to display here. Links are posted instead.


other angle

And another angle
GONZOMay 5th, 2009, 2:08 pm
Site Editor
"Bear Swamp," PA

Posts: 1681

Your stonefly is a member of the Taeniopterygidae, aka "winter stoneflies" or "willowflies." The smaller stoneflies that you saw might belong to another family, the Nemouridae, aka "spring stoneflies" or "forestflies." The emergence of some members of these two families overlaps at this time of year. (They look much alike, but the nemourids are generally smaller, emerge later, and have shorter second tarsal segments.)

BTW, per your previous thread, the #14 mayfly nymphs in the cup with your damselfly nymph are probably Hendrickson nymphs (Ephemerella subvaria).

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