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)
Post Reply
LeskorcalaApril 7th, 2020, 7:41 pm
Posts: 16Love 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: 356		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
LeskorcalaApril 8th, 2020, 9:08 pm
Posts: 16Thank 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: 356		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.
KonchuApril 10th, 2020, 10:50 am
Site Editor
Indiana

Posts: 503		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
Paraleptophlebia sp.
(2 more)

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
Re: Montana Western March Brown Dun
In the Photography Board by Leskorcala		2Apr 10, 2020
by Partsman
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
Possibly Gray Drake collected April Bitterroot river
In the Identify This! Board by Leskorcala		0
Most Recent Posts
Re: The South Holsten River
In Fishing Reports by Martinlf
Re: Tellico Nymph
In Fly Tying by Coha (Wbranch replied)
Michigan's Ausable River System
In General Discussion by Oxbow
Re: Trico Spinner, as requested
In the Identify This! Board by Gutcutter (Wiflyfisher replied)
Re: Trico nymphs and emergers
In the Mayfly Genus Tricorythodes by Steamntrout (Martinlf replied)
Re: Holy Grail Caddis pupa
In Fly Tying by Coha (Wbranch replied)
Re: Centroptilum
In the Identify This! Board by Wbranch (Konchu replied)
Re: Jonathon's moving again...
In General Discussion by Jmd123 (Martinlf replied)
Re: Bald-Tailed Baetidae
In General Discussion by Dickybird (Konchu replied)
Re: 2 insect wing vein questions, and 1 on etymology
In General Discussion by Dickybird (Troutnut replied)