Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > NW

Maverick has attached these 2 pictures to aid in identification. The message is below.
View Full SizeView Full Size (4.1X larger)
View Full SizeView Full Size (1.8X larger)
MaverickJune 11th, 2007, 2:50 pm
up the creek w/o a paddle

Posts: 5
These guys were coming off strong from 3pm to 7pm. Moving water. 2 tails. Looks like a Hex but only 15mm. Wing and forewing completely opaque. No coloration in the wing. Even on the leading edge. Small veins on tips of wings not present. Pic #2 Notice the markings on the noticibly lighter top of the throax. Segments on back are brown but under body just pale yellow(no dark markings)Are there Nixe's this big?
TroutnutJune 11th, 2007, 6:05 pm
Administrator
Bellevue, WA

Posts: 2548
Where did you collect them?
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonJune 11th, 2007, 6:52 pm
Site Editor
Plano, TX

Posts: 1297
Probably Siphlonurus.
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutJune 11th, 2007, 7:45 pm
Administrator
Bellevue, WA

Posts: 2548
Those look a lot like one damaged specimen I collected two years ago. Surely they're closely related, although the dorsal markings seem sufficiently different that they're probably different species. I would love to have one of the real entomologists weigh in here. I suspect they're some sort of Heptageniid but I can't say for sure.

I really doubt Siphlonurus. I've never heard of them having yellow bodies.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
MaverickJune 11th, 2007, 7:52 pm
up the creek w/o a paddle

Posts: 5
These are from a tailwater in eastern oregon. Lake supports warmwater species. Tailwater below is about 3,000 ft ele. Bugs hatched in faster water just above slow moving pools. Nymphs have 3 tails, duns two. I thought marking on top would be a dead give away for someone. Which specie of Siph gets to about 15mm or 5/8in w/o tail.
Thanks in advance
MaverickJune 11th, 2007, 7:56 pm
up the creek w/o a paddle

Posts: 5
Forget to mention the body is fairly robust unlike a brown drake. The bottom of the abdomen is very flat...
KonchuJune 12th, 2007, 4:26 am
Site Editor
Indiana

Posts: 496
this flat bottom of the abdomen: is is all pale, or is it colored & marked in some way?
MaverickJune 12th, 2007, 8:02 am
up the creek w/o a paddle

Posts: 5
all pale.
MaverickJune 12th, 2007, 8:38 am
up the creek w/o a paddle

Posts: 5
In doing some further discovery I may have them. Let me know what you guys think. Ephemeroptera/Heptageniidae/Epeorus/Hesperus.
Listed as Endangered, no real common name but Yellow quill.
The description and geo sure fits. Water type cold moving water (this is a tailwater). All patterns note the need to match the unusually flat body both in the nypmph and adult. Coloration is right on olive nymph pale dun. They are found of the Makenzie river not too far away from the location in question. Size of the sub-image about 5/8".
Unique characterists of the hatch are that they break their shucks @ the bottom and don't float very long before flight. This would correspond to the trouts behavior of splashy rises. Also noted in the info. Was the lack of any witnessed spinnerfall a mystery. That would be consistent with what I have observed over the last three weeks.The data says that they hatch typically between Memorial day and the 4th of July. Anybody familar with this hatch/bug?
TaxonJune 12th, 2007, 2:18 pm
Site Editor
Plano, TX

Posts: 1297
Anybody familar with this hatch/bug?


Two (perhaps pertinent) items:

The Biology Of mayflies lists the adult body length of this species as being 10 mm. Also, Epeorus would have 2 tails in their nymphal life stage.
Roger Rohrbeck
www.FlyfishingEntomology.com

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.

Related Discussions

TitleRepliesLast Reply
Re: Help with ID
In the Identify This! Board by Calloway
2Jul 9, 2008
by Wiflyfisher
Re: Nectopsyche larva and pupa
In the Identify This! Board by Millcreek
7Jun 19, 2015
by Oldredbarn
Re: Ribbing/Suggestions
In Fly Tying by Lastchance
10Apr 2, 2013
by Feathers5
Re: Nymph??
In the Identify This! Board by Btbo32
7Nov 4, 2017
by Btbo32
Emergence
In Brachycentrus appalachia Caddisfly Adult by Martinlf
0
Re: batflies
In the Mayfly Family Baetiscidae by Tnoetzel
6Jan 28, 2009
by Martinlf
Re: Mayfly Nymph Help?
In the Identify This! Board by Swimming
3Nov 2, 2012
by Entoman
SW Colorado
In General Discussion by Motrout
0
Re: Gilvipes or atripes?
In Female Dicosmoecus atripes Caddisfly Adult by Entoman
7Dec 19, 2016
by Clark2016
Re: Hike in the Clearwater Mountains in the Alaska Range (Day 2 of 4)
In Site Updates by Troutnut
2Aug 3, 2013
by Troutnut
Most Recent Posts
Re: Best guess at this bug. Smut (Simuliidae)
In General Discussion by Pdcox (Martinlf replied)
Re: Rio Puerco, Northern New Mexico
In Fishing Reports by Red_green_h (Troutnut replied)
Re: Tiny Black Caddis hatch, late fall - Nov 26 to be exact_ Spring Creek Southern MO
In the Caddisfly Family Hydroptilidae by Dai_sca (Pdcox replied)
Must Read This on my New Reel Purchase
In Gear Talk by 6106b
Re: Stonefly?
In the Identify This! Board by Pdcox (Taxon replied)
Re: Streamer rig set up questions
In Gear Talk by Fliesties22 (Martinlf replied)
Iowa Driftless
In General Discussion by KevinB
Re: fall bluewinged olive coloration.
In Fly Tying by Partsman
Re: Thankful
In General Discussion by Martinlf (Strmanglr replied)
Re: My (new) place and its environs
In the Photography Board by Jmd123 (Martinlf replied)