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

> > Bitterroot river April mayfly nymph ?

Leskorcala has attached these 2 pictures to aid in identification. The message is below.
View Full SizeView Full Size (4.9X larger)
View Full SizeView Full Size (4.9X larger)
LeskorcalaApril 7th, 2020, 7:41 pm
Posts: 10Love to pick few brains to ID this black and white mayfly nymph I just collected one on Bitterroot river in Montana April 7th I found it under tree trunk
Thanks
MillcreekApril 8th, 2020, 9:28 am
Healdsburg, CA

Posts: 342
Definitely a member of Heptageniidae. Might be a Rhithrogena. If you still have the specimen, put it on it's back and see if the gills form a "suction cup", or if they meet in front and back, like in this picture.

https://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0816+0153
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
LeskorcalaApril 8th, 2020, 9:08 pm
Posts: 10Thank you for your help fortunately i did not collect the specimen, i will try next time out.Very different in black and white or cream markings which i have not seen often.
MillcreekApril 8th, 2020, 9:25 pm
Healdsburg, CA

Posts: 342
I'm guessing at Rhithrogena. Seems likely because of the general aspect of it. The color is unusual for Rhithrogena but there are several undescribed species of western Rhithrogena nymphs.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
KonchuApril 10th, 2020, 10:50 am
Site Editor
Indiana

Posts: 498
That looks like my search image of a living Rhithrogena. I'm only aware of R. undulata having been found in the Bitterroot R in MT, but like Millcreek said, we don't know as much about the nymphs as we'd like. The record I have was from a June emergence, FWIW.

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: Skwala question
In Skwala Stonefly Nymph by Gillybilly
6Feb 20, 2020
by Leskorcala
Re: Second opinions on this one's ID?
In Male Rhithrogena morrisoni Mayfly Spinner by Troutnut
3Jul 5, 2017
by Crepuscular
Re: Identify
In General Discussion by Lastchance
1Jun 17, 2012
by Taxon
Suwallia sp.
In the Photography Board by Millcreek
0
Re: Ecdyonurus spp, with Symbiocladius parasites
In the Identify This! Board by Millcreek
5Jan 11, 2015
by Entoman
Paraleptophlebia sp.
(2 more)

In the Photography Board by Millcreek
0
Re: Montana Western March Brown Dun
In the Photography Board by Leskorcala
2Apr 10, 2020
by Partsman
Possibly Gray Drake collected April Bitterroot river
In the Identify This! Board by Leskorcala
0
Re: Chile in early March
In General Discussion by EricStroup
9Dec 14, 2007
by Jmd123
Re: Isonychia velma nymphs
In the Photography Board by Millcreek
7Aug 19, 2014
by Oldredbarn
Most Recent Posts
Re: A death in the family...RIP Leo the Lionheart
In the Photography Board by Jmd123 (LearingtoFl replied)
Re: Anual San Pedro Parks Wilderness backpacking trip
In Fishing Reports by Red_green_h (Martinlf replied)
Re: Happy Memorial Day to my fellow Troutnuts with wildflowers from my front yard
In the Photography Board by Jmd123 (Martinlf replied)
Re: Clark's Marsh, flooded
In the Photography Board by Jmd123 (Martinlf replied)
Re: One of my hydropower dam projects just blew out!
In General Discussion by Jmd123
Re: My fly tying buddy
In the Photography Board by Wbranch (Martinlf replied)
Re: Metro Detroit Trout
In Fishing Reports by Summer_doug (Brian314 replied)
Re: Caddis query
In Fly Tying by Roguerat (Wbranch replied)
Re: Looking for a silk fly line
In Gear Talk by Johnsteve (Wbranch replied)
Re: FREEDOM!
In General Discussion by Roguerat (Jmd123 replied)