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Entomology Basic entomology for the fly fisher to help identify insects that one might encounter on the stream or in a stillwater.

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Old 06-09-2014, 08:47 PM
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Default Help With Stonefly ID

Found some very large stonefly shucks and adults on my local stream today and I'm looking for some help with idenitification. The ruler in the photos is metric, so the shucks and adult are roughly 20 mm or 3/4" in length. These are from the driftless area in SE MN.

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Old 06-10-2014, 09:26 AM
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Default Re: Help With Stonefly ID

Stonefly Encyclopedia: 500+ photos, life cycles, & fly fishing hatches
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Old 06-10-2014, 09:30 AM
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Default Re: Help With Stonefly ID

Those look to be a dark stone even the fly you have i would call a dark stone.
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Old 06-10-2014, 10:10 AM
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Default Re: Help With Stonefly ID

The exoskeletons (shucks) look like golden stones, but the adult you picture appears to be a fishfly not a stonefly. I don't know of any stoneflies with the white splotches on their wings.

Nigronia fasciata, Dark Fishfly, family Corydalidae

https://naturallycuriouswithmaryholl.../march/page/8/

I could be wrong, but I have never seen nor heard of stoneflies that look like the one you have pictured.

Kelly.
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Old 06-10-2014, 02:50 PM
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Default Re: Help With Stonefly ID

Quote:
Originally Posted by kglissmeyer1 View Post
The exoskeletons (shucks) look like golden stones, but the adult you picture appears to be a fishfly not a stonefly. I don't know of any stoneflies with the white splotches on their wings.

Nigronia fasciata, Dark Fishfly, family Corydalidae

https://naturallycuriouswithmaryholl.../march/page/8/

I could be wrong, but I have never seen nor heard of stoneflies that look like the one you have pictured.

Kelly.
Thanks Kelly. After looking at the links you posted, I'm sure you are right. I guess I jumped to conclusions when finding the large stonefly shucks and large black flies on the same day. Apparently those two observations and pictures are unrelated!
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Old 06-10-2014, 03:42 PM
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Default Re: Help With Stonefly ID

So, Kelly, that fishfly is related to dobson's? Would that mean the nymph stages are similar to a Hellgrammite?
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Old 06-10-2014, 04:12 PM
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Default Re: Help With Stonefly ID

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Originally Posted by bigjim5589 View Post
So, Kelly, that fishfly is related to dobson's? Would that mean the nymph stages are similar to a Hellgrammite?
What I researched shows that they are related to dobsonflies and alderflies, so a natural assumption would be the larva are similar to hellgrammites, and the Troutnut site confirms this: Hellgrammite Species Nigronia serricornis (Fishfly) hatch & pictures

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Old 06-10-2014, 04:14 PM
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Default Re: Help With Stonefly ID

Very cool! Thank you!
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