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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Boerie has attached these 3 pictures to aid in identification. The message is below.
The larger subimago was about 22-24mm in length
Close up of the smaller brown subimago
Boerie
Scotland / Russia

Posts: 9
Boerie on Feb 9, 2008February 9th, 2008, 11:09 am EST
Mayfly duns photographed on a northern Kola peninsula river called the Eastern Litza
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Dryfly
rochester mn

Posts: 133
Dryfly on Feb 9, 2008February 9th, 2008, 4:37 pm EST
The large yellow one looks like something in the Heptangenidae family.
The other one looks like it belongs to the Ephemerellidae family. It is a male to since it has the large turbinate eyes. No idea what species.Nice pictures.
Taxon
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Plano, TX

Posts: 1311
Taxon on Feb 9, 2008February 9th, 2008, 5:12 pm EST
Yuri-

Believe your small male subimago to be of genus Ephemerella. Don't have access to distribution records for the Kola Peninsula, but do know that Finnish Ephemerella include both Ephemerella aronii (actually a junior synonym for Ephemerella aurivillii) and Ephemerella mucronata.

With regard to your large female, it looks a lot like Epeorus, perhaps Epeorus pellucidus. Did your measurement possibly include the length of the tails?

At the very least, my post should trigger some healthy rebuttal.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Boerie
Scotland / Russia

Posts: 9
Boerie on Feb 9, 2008February 9th, 2008, 9:50 pm EST
Thanks Guys

My intial suspicions were Heptangenidae and Ephemerellidae but I am still very uncertain. I have managed to track down a freshwater biologist from PINRO in Murmansk (northern Russia). He or one of his colleagues may have some input.

Roger, I think you could well be on the right track. No, the measurement does not include the tails. It has to be one of the largest mayflies I have seen so far.

If PINRO produce any feedback I will be sure to let you know.


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Taxon
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Plano, TX

Posts: 1311
Taxon on Feb 10, 2008February 10th, 2008, 12:47 am EST
Yuri-

The leading expert on Russian mayflies is likely Dr. Nikita J. Kluge of St. Petersburg University. If you should choose to contact him, please share his response with us.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Martinlf
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Palmyra PA

Posts: 3047
Martinlf on Feb 10, 2008February 10th, 2008, 8:36 am EST
OK, where else do you get to see photos of Russian Mays?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Taxon
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Taxon on Feb 10, 2008February 10th, 2008, 9:37 am EST
OK, where else do you get to see photos of Russian Mays?


Louis-

Not sure if that was a serious or rhetorical question. However, if you are thinking that my intent was to discourage Yuri from posting his photos of Russian mayflies on this forum, nothing could be further from the case. It was just that Yuri is already in contact with a Russian biologist, and I thought he might like the name of the ultimate Russian mayfly specialist.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Feb 11, 2008February 11th, 2008, 12:30 pm EST
Actually I thought your response was a great one, Roger, giving him some solid suggestions on where to get more help. My comment was more like, "How cool is this, seeing photos of Russian mayflies?" or, "This seems to be the only place I know of where we get such diversity of posts and photos--neat." Remember the guy from (I think it was) Greece who posted up some great photos of trout he had caught? No, I didn't find your post at all discouraging, but rather encouraging, and, if my previous post was confusing, I would like to thank Yuri a bit more clearly in this one for sharing his photos.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Boerie
Scotland / Russia

Posts: 9
Boerie on Feb 12, 2008February 12th, 2008, 4:54 am EST
I have e-mailed several Russian authorities on ephemera, including Prof
Kluge. I will post any results as soon as i receive them.

Thanks for that contact Roger - he is most certainly the Mayfly guru and both the other scientists knew of him.

Will be in touch.
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Taxon
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Plano, TX

Posts: 1311
Taxon on Feb 12, 2008February 12th, 2008, 6:56 am EST
Yuri-

You are certainly welcome. I am as interested in what they have to say as you are. However, I wouldn't be surprised if they either don't agree on ID, or are unwilling to offer an opinion without male imago in hand to put under the microscope.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Boerie
Scotland / Russia

Posts: 9
Boerie on Feb 15, 2008February 15th, 2008, 9:34 pm EST
Right, here we have it from the master!
"Judging by the photographs, these are male subimago of Ephemerella ignita (smaller, with red eyes) and female subimago of Heptagenia sulphurea (larger, with yellow wings)"

Apparently both a common trans-Palaearctic species.

Thanks for all your help chaps.

Regards

Yuri
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Taxon
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Taxon on Feb 17, 2008February 17th, 2008, 10:08 pm EST
Yuri-

Is that Professor Kluge?

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Boerie
Scotland / Russia

Posts: 9
Boerie on Feb 18, 2008February 18th, 2008, 6:42 am EST
Yes, the above was from Prof Kluge.
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