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

> > Kogotus / Rickera

Millcreek has attached these 4 pictures. The message is below.
View Full SizeView Full Size (2.8X larger)
Shown Full Size
Shown Full Size
View Full SizeView Full Size (2.4X larger)
MillcreekMay 28th, 2016, 10:03 pm
Healdsburg, CA

Posts: 328
I found this one in the Russian River on a substrate of gravel and cobble in a glide. It's rarely collected in this part of the river. I've found two of them so far. Collected on the 26th of April. Overall length is 15 mm excluding the cerci.

Originally had the genus and species at Rickera sorpta using Stewart and Stark's "Nymphs of North American Stonefly Genera (Plecoptera)"and Stewart and Stark's "Nymphs of North American Perlodinae Genera (Plecoptera; Perlodinae)".

However when I submitted it to Bugguide I found out that it is referred to as Kogotus/Rickera. I'll let the following serve as an explanation.

Kogotus vs. Rickera
For California aquatic bioassessment, we routinely leave perlodid nymphs with unidentate lacinia at the provisional (colloquially, "slash ID") taxon Kogotus/Rickera. The reason for this is that the single character given in the various keys (Stewart and Stark, 2002, for one) is the presence of a transverse suture connecting the anterior corners of the furcal pits for Rickera. This character is considered absent for Kogotus. However, this is not a straightforward character. According to my colleague and Plecoptera specialist, John Sandberg, this is actually a character of the adult showing through the larval exoskeleton. Weve seen the cuticle fold in that exact location on Kogotus nymphs from Colorado, thus making them appear to be Rickera, even though weve had associated Kogotus modestus adults from those locations and Rickera does not range that far East.

Both Rickera sorpta and Kogotus nonus are known from CA, but we dont know the complete distributions for each, only that they likely overlap. We have several nice populations of Rickera here in Butte and Plumas Counties which weve been studying for many years, so we have adults and associated final instar nymphs. Otherwise, the nymph pigment patterns are so similar between the two taxa, we cant reliably separate specimens without having reared or carefully associated nymphs from the same location as live-caught adults.

For this specimen, Id recommend leaving the ID at Diploperlini or using the slash ID of Kogotus/Rickera. I know this is not a satisfying determination, but to place this specimen to species would basically be a guess without associated adults. Speaking of which, Id suggest watching for adults or attempting to rear out nymphs to make the species association. I can't recall whether you've been rearing aquatics, but if not, either John or I would be glad to give you some pointers on a very easy and efficient rearing method for stonefly nymphs.
Brady Richards, 29 April, 2016 - 1:43pm
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
EntomanJune 3rd, 2016, 4:06 pm
Site Editor
Northern CA & ID

Posts: 2604
Hey Mark,

Excellent thread.. Love to hear about the method for raising Stonefly nymphs. I've never had much luck at it so it would be very helpful. I'm assuming it will also work for mayfly clinger nymphs where it would be beyond very helpful!
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
MillcreekJune 3rd, 2016, 10:10 pm
Healdsburg, CA

Posts: 328
Kurt - Since I only found a couple of these nymphs, rearing them didn't seem practical, however here is a link to an article by these guys on stonefly rearing.
Article starts on page 4.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
TroutnutJuly 29th, 2019, 3:57 pm
Bellevue, WA

Posts: 2541
I'm bumping this interesting thread because I'm trying to identify a "Kogotus/Rickeri" that turned up abundantly in my samples from a small stream in Washington.

Edit: Nevermind. I got an adult from the same date/site that keys to Kogotus nonus, so I'm assuming the nymphs are the same. It's still an interesting post, anyway.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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: Kogotus / Rickera and Isoperla mormona pictures
In the Photography Board by Millcreek
4May 11, 2017
by Millcreek
Re: Calineuria californica and Hesperoperla pacifica
(3 more)

In the Photography Board by Millcreek
1Jan 30, 2016
by Martinlf
Re: Interesting clinger species
In the Identify This! Board by CalebBoyle
7Mar 31, 2007
Capnia umpqua
(2 more)

In the Photography Board by Millcreek
Re: Nixe species (kennedyi?)
(2 more)

In the Identify This! Board by Millcreek
4Sep 27, 2014
by Millcreek
Re: Isoperla nymphs
(2 more)

In the Photography Board by Millcreek
6Sep 4, 2014
by Oldredbarn
Suwallia sp.
In the Photography Board by Millcreek
Re: larvae vs nymph
In the Identify This! Board by Billq
7Nov 5, 2018
by Wbranch
Re: Short grayling fishing trip on Nome Creek
In Site Updates by Troutnut
6Jun 29, 2013
by Jmd123
Re: How many flies?
In Fly Tying by FisherOfMen
4Jan 7, 2012
by FisherOfMen
Most Recent Posts
Re: Cold weather fly fishing
In Beginner Help by Red_green_h (Jmd123 replied)
6wt reel help
In Gear Talk by Swampfox
Re: Boots
In Gear Talk by Martinlf (Wbranch replied)
Re: nm
In Gear Talk by Red_green_h
Re: My (new) place and its environs
In the Photography Board by Jmd123 (Partsman replied)
Re: Holy Waters - over-rated
In General Discussion by Brian314 (Partsman replied)
Re: Site updates from September 11, 2019
In Site Updates by Troutnut (Martinlf replied)
Re: Fly fishing Basque Country in Spain
In General Discussion by 87Defender (Wbranch replied)
Re: Spain? Rules, licenses and such?
In General Discussion by Shanti (Martinlf replied)