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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 Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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.
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Wiflyfisher has attached this picture to aid in identification. The message is below.
Small green-eye mayfly dun.
Wiflyfisher
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Wisconsin

Posts: 622
Wiflyfisher on Aug 11, 2007August 11th, 2007, 7:25 am EDT
Konchu & Taxon... small, green-eye mayfly dun, 1/4" long body length. What is it?
Konchu
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Site Editor
Indiana

Posts: 498
Konchu on Aug 11, 2007August 11th, 2007, 8:25 am EDT
Leucrocuta?
Wiflyfisher
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Wisconsin

Posts: 622
Wiflyfisher on Aug 11, 2007August 11th, 2007, 9:40 am EDT
okay Thank you!

Leucrocuta hebe (Little Yellow Quill). Although it looks darker than the one's Jason has on the web site, but probably from the same trout stream.
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Aug 11, 2007August 11th, 2007, 10:49 am EDT
John-

Konchu nailed it, for sure, but I’ll try to contribute something by posting one of Jason’s photos to which you referred, when you mentioned that yours was darker, but probably from the same trout stream.



Wisconsin has two species of Leucrocuta, L. hebe, and L. maculipennis, and based on their respective descriptions, it could be either. Both are referred to in earlier literature by genus name Heptagenia.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Aug 11, 2007August 11th, 2007, 1:43 pm EDT
This is timely, I saw one of these today. It floated down to me, dead?? on a small spring creek.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Konchu
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Site Editor
Indiana

Posts: 498
Konchu on Aug 12, 2007August 12th, 2007, 4:27 am EDT
The species IDs in this genus are tough now. Some of the names aren't tied down real well to morphotypes. So be careful...

Wiflyfisher, did you save the specimen you photographed?
Wiflyfisher
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Wisconsin

Posts: 622
Wiflyfisher on Aug 12, 2007August 12th, 2007, 4:30 am EDT
Yes, I saved it but it is all dried up and I don't remember which small sample bug box I put him in. ;)
Wiflyfisher
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Wisconsin

Posts: 622
Wiflyfisher on Aug 12, 2007August 12th, 2007, 4:33 am EDT
Heptagenia mayflies I have seen over the years on this same river were a more pale yellow. I might have mistaken it for something else now that I see Jason's photos.

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