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> > Help with Early Spring Stoneflies

WiflyfisherMarch 12th, 2021, 8:53 am
Wisconsin

Posts: 639
Three different looking stoneflies that have all recently emerged.

This first one is about 3/8" long.


This stonefly I believe maybe the Early Brown Stonefly, which has a wing length of about 5/8" long.


This one caught me by surprise. It is about 5/8" long but had dark orangish spots at the top of it wing and at the first joint of its legs.


Can anyone help ID these three Spring stoneflies? I find it difficult to find good reliable inforamtion on stonefly adults.


John S.
https://WiFlyFisher.com
PartsmanMarch 13th, 2021, 4:09 am
bancroft michigan

Posts: 367
Wiflyfisher, looking at my copy of Hatch Guide of For Upper Midwest Streams it would appear that the last stone fly could be Pteronarcys dorsata - Gaint Stonefly.
Mike.
TaxonMarch 13th, 2021, 8:05 am
Site Editor
Plano, TX

Posts: 1323
Hi John-

I believe these adult stoneflies to be of family Nemouridae, and to be commonly referred to as Forestflies. The members of this family known to be present in Wisconsin include:

Scientific Name (Common Name)
Amphinemura delosa (Eastern Forestfly)
Amphinemura linda (Lovely Forestfly)
Amphinemura varshava (Warsaw Forestfly)
Nemoura trispinosa (Three-spined Forestfly)
Prostoia completa (Central Forestfly)
Prostoia similis (Longhorn Forestfly)
Shipsa rotunda (Intrepid Forestfly)
Soyedina vallicularia (Valley Forestfly)

Hope this is useful. :-)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
WiflyfisherMarch 13th, 2021, 3:09 pm
Wisconsin

Posts: 639
Hi Roger,

Thanks for the homework. :-)

Mike, I do not believe it is Pteronarcys dorsata. Although it does have some similarities the size and wing design is different. I have seen the Giant Stonefly on this river in mid-June, so has Jason N.

Thank you both.

Today, there were a lot of stoneflies (like my middle photo) ovipositing on the river. The wind seemed to blow them out of the brush. I definitely saw closeup one stonefly with the egg sack attached. It appeared pale tellowish/olive and she dropped it when I picked her up off of the water.

John S.
https://WiFlyFisher.com
WiflyfisherMarch 14th, 2021, 8:30 am
Wisconsin

Posts: 639
Here is a good macro photo that I took of a couple of stoneflies I captured yesterday. I resized the original photo before uploading. I do like the macro photo stacking feature on the Olympus TG-6 camera.



I did see a stonefly with a pale yellowish/olive egg sack. When I picked up the stonefly she dropped the egg sack before I could get a good look at it.

Jason emailed me it might be Strophopteryx fasciata. i think he is spot on, especially since he has specimens of this stonefly on the same river I am fishing... http://www.troutnut.com/specimen/349

John

John S.
https://WiFlyFisher.com
PartsmanMarch 14th, 2021, 11:30 am
bancroft michigan

Posts: 367
Awesome pics Wiflyfisher, I was on a north Michigan stream last week. No stoneflies yet, a few bwo’s.
Mike.
WiflyfisherMarch 14th, 2021, 1:48 pm
Wisconsin

Posts: 639
Having limited materials with me and fluttering Willowfly stoneflies teasing the trout to rise, I designed this dry fly that has been super effective. Even a couple of 16-17" trout sucked the fly in which is nice on a dry fly this time of year.





The body is peacock herl with a Collin's dark dun hen feather wrapped palmer still and a deer hair wing, size #12. I hit it with some Frog's Fanny to help it float when I cast it upstream and across. I think the soft hen barbules keep it in the film and the trout definitely approved. I would never use hen feathers for the palmer but I have no rooster capes with me right now. The softer hen feather with peacock herl seems to work better in this situation, which I discovered by accident based on the few materials I have with me.

Ironically, I don't have my magnifying glasses with me to help tie flies. I am finding I am okay tying size #12 flies without them. :-)

John S.
https://WiFlyFisher.com
MartinlfMarch 14th, 2021, 5:53 pm
Moderator
Palmyra PA

Posts: 3125
Well done! Glad to see a fish in the net, and a beauty at that! Thanks for sharing.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Jmd123March 17th, 2021, 10:21 am
Oscoda, MI

Posts: 2508
Nice! Beautiful fish! I never did anything on those early black stones, though one April I had early brown stones in the Rifle & had rises & hits (but no hookups). Well done!

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
WiflyfisherMarch 17th, 2021, 10:29 am
Wisconsin

Posts: 639
Jonathon, that brings up a question? Is the "Early Brown Stonefly" really the "Mottled Willowfly" (Strophopteryx fasciata)?

I believe they are one and the same.
John S.
https://WiFlyFisher.com
TaxonMarch 26th, 2021, 8:13 am
Site Editor
Plano, TX

Posts: 1323
Jonathon, that brings up a question? Is the "Early Brown Stonefly" really the "Mottled Willowfly" (Strophopteryx fasciata)?

I believe they are one and the same.


Hi John-

I believe the answer to your question is that all Mottled Willowflies are Early Brown Stoneflies, but not all Early Brown Stoneflies are Mottled Willowflies. :-)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
WiflyfisherMarch 26th, 2021, 10:08 am
Wisconsin

Posts: 639
Jonathon, that brings up a question? Is the "Early Brown Stonefly" really the "Mottled Willowfly" (Strophopteryx fasciata)?

I believe they are one and the same.


Hi John-

I believe the answer to your question is that all Mottled Willowflies are Early Brown Stoneflies, but not all Early Brown Stoneflies are Mottled Willowflies. :-)


Hi Roger,

Since when did you start using "common names" to ID aquatic insects? LOL!!

I hope all is well.

John S.
https://WiFlyFisher.com
Jmd123March 30th, 2021, 7:32 am
Oscoda, MI

Posts: 2508
I'm hoping to get a crack at them whatever they are called! All depends on rainfall, the Rifle gets scary for wading when the water goes up...

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
TaxonMarch 30th, 2021, 4:36 pm
Site Editor
Plano, TX

Posts: 1323

Hi Roger,

Since when did you start using "common names" to ID aquatic insects?

Good one, that, John.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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