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

> > Puzzled on this mayfly, not even confident on family

The Specimen

Rhithrogena Mayfly SpinnerRhithrogena  Mayfly Spinner View 14 Pictures
Collected July 8, 2019 from the Ruby River in Montana
Added to Troutnut.com by on July 18, 2019

The Discussion

TroutnutJuly 23rd, 2019, 12:11 am
Administrator
Bellevue, WA

Posts: 2533
This seems to be some sort of Heptageniid, based on the two tails and five segments on the hind tarsus. Following the key in Merritt & Cummins seems to lead to Rhithrogena, but it doesn't fit a characteristic described in Needham's Biology of Mayflies for that genus: "Tibia of hind leg in both sexes about 1/4 length of femur."
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
MillcreekJuly 23rd, 2019, 2:34 pm
Healdsburg, CA

Posts: 327
For what it's worth, this seems to be Heptageniidae and Rhithrogena based on the wings and penes. Also, if you take a look at Bugguide the photos there don't show the hind tibia being 1/4 the length of the femur.


https://bugguide.net/node/view/50753/bgimage?from=0
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

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: Mayfly from Chalk stream
In the Identify This! Board by Stanislav
12May 4, 2007
by Taxon
Re: Arctopsyche Grandis
In the Caddisfly Genus Arctopsyche by Epeorus
6Jul 6, 2014
by Entoman
Re: Big Spinner
In the Identify This! Board by Al514
3Jun 18, 2007
by Konchu
Re: Spinadis simplex
In Female Heptageniidae Mayfly Dun by Taxon
1Jul 20, 2019
by Troutnut
Re: Amiocentrus aspilus
(1 more)

In the Photography Board by Millcreek
5Mar 7, 2015
by Millcreek
Re: The current status of """Rhithrogena""" ???? in Southern Ontario
(2 more)

In the Identify This! Board by Brookyman
4Nov 6, 2012
by Brookyman
Re: itzy-bitzies!
In the Identify This! Board by Wiflyfisher
6Aug 9, 2007
by Martinlf
Re: Mayfly: Baetidae? Spain
In the Identify This! Board by Isidro
16Jun 4, 2008
by And
Re: Baetis Nymphal Shucks
In General Discussion by Baetis7
19Aug 26, 2014
by Crepuscular
Chloroperlidae
In Sweltsa Stonefly Nymph by Earlfishman
0
Most Recent Posts
Re: Fly Tying Vise
In Gear Talk by William99 (Wbranch replied)
Re: Caddis on a zig zag
In General Discussion by TDMunro (Partsman replied)
Re: Rhyacophila betteni group
In Rhyacophila Caddisfly Larva by Creno
Re: This appears to be Dixa sp.
In Dixa True Fly Larva by Creno (Jmd123 replied)
Re: The boys were back in town, Chapter 4 part II
In the Photography Board by Jmd123
Re: The boys were back in town, Chapter 4: new digs, new waters, new fish!
In the Photography Board by Jmd123
Psocodea
In Psocodea Insect Adult by Creno
Rhyacophila hyalinata group
In Rhyacophila vocala Caddisfly Larva by Creno
Re: Don't think it is Gumaga........
In Lepidostoma Little Brown Sedge Larva by Creno (Troutnut replied)
New Instagram account
In Site Updates by Troutnut