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

> > Onocosmoecus larvae and cases

Millcreek has attached these 8 pictures. The message is below.
View Full SizeView Full Size (1.6X larger)
Mature larva. 22 mm. In alcohol.
Mature larva. 22 mm. In alcohol.
View Full SizeView Full Size (1.8X larger)
Mature larval case. 24 mm. In alcohol.
Mature larval case. 24 mm. In alcohol.
View Full SizeView Full Size (1.6X larger)
Mature larval case. 23 mm. (not including trailing stick). In alcohol.
Mature larval case. 23 mm. (not including trailing stick). In alcohol.
Shown Full Size
Mature larva. 22 mm. In alcohol.
Mature larva. 22 mm. In alcohol.
Shown Full Size
Mature larva. 22 mm. In alcohol.
Mature larva. 22 mm. In alcohol.
View Full SizeView Full Size (1.1X larger)
Early instar larva. 12 mm. In alcohol.
Early instar larva. 12 mm. In alcohol.
Shown Full Size
Intermediate larval case and larva. Case shows characteristics of early instar case towards the back while incorporating flat pieces towards the front. Case 15 mm. In alcohol.
Intermediate larval case and larva. Case shows characteristics of early instar case towards the back while incorporating flat pieces towards the front. Case 15 mm. In alcohol.
Shown Full Size
Early instar larva. Case 14 mm. In alcohol.
Early instar larva. Case 14 mm. In alcohol.
MillcreekOctober 30th, 2014, 7:49 pm
Healdsburg, CA

Posts: 315
A fairly common caddisfly in smaller tributaries of the Russian River though I haven't found it in the mainstem. The larvae were identified to genus using Merritt, Cummins and Berg (2008) and Wiggins (1976). They're probably Onocosmoecus unicolor. The larvae are usually found in areas of slow current in deeper water that has undercut banks with tangles of roots or branches extending below the waterline. Sweeping along the roots or branches yields the largest numbers of larvae. Earlier instar larvae construct cases of bits and pieces of twigs and flat pieces of wood that are irregular in appearance while later instars construct a more orderly case out flat pieces of wood, often with a stick trailing out from the bottom end of the case. Most larvae were collected from February through May.
"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: Neophylax larvae and pupae
(9 more)

In the Photography Board by Millcreek
3Nov 27, 2014
by Millcreek
Re: Agapetus larva and pupa
(8 more)

In the Photography Board by Millcreek
6Jul 7, 2015
by Millcreek
Re: A couple of Odontoceridae - Marilia and Nerophilus
(11 more)

In the Photography Board by Millcreek
4Oct 29, 2014
by Millcreek
Re: Nectopsyche sp.
(1 more)

In the Identify This! Board by Millcreek
2Jan 15, 2015
by Creno
Re: Donegal Spring Creek
In Fishing Reports by Wbranch
2May 8, 2011
by Wbranch
Re: Heteroplectron californicum
(2 more)

In the Photography Board by Millcreek
8Oct 15, 2014
by Crepuscular
Re: trying to figure out
In the Insect Family Corydalidae by Buggy
1Apr 19, 2009
by GONZO
Re: Oecetis sp. larvae and pupae
(3 more)

In the Identify This! Board by Millcreek
9Jul 7, 2015
by Millcreek
Re: What are these??
In the Photography Board by Keystoner
7Oct 8, 2010
by Konchu
Capnia umpqua
(2 more)

In the Photography Board by Millcreek
0
Most Recent Posts
Re: Fly Rod Building
In Gear Talk by Summer_doug (Flamey replied)
Re: Elk River British Columbia Rising Cutthroat Trout August 2018
In Fishing Reports by Srfwl (Martinlf replied)
Re: "Plan C"?? Subtitled: you can never have too many backups
In General Discussion by Jmd123 (Martinlf replied)
Re: WV Fly Fisherman
In Fishing Reports by Flamey
Re: Can I put an 8wt reel on a 5wt rod?
In Gear Talk by Ogilvy (Serengeti replied)
Re: How do you post photos to Troutnut??
In General Discussion by Gunnison
Re: Ladies and gentlemen, Plan B has been formulated
In General Discussion by Jmd123 (Iasgair replied)
Re: Long-time reader, never-time poster? Start here!
In General Discussion by Troutnut (Jmd123 replied)
Re: Streamer rod for lakes
In Gear Talk by Barbaube (Iasgair replied)
Re: CDC Dry Fly Midge - size 26 hook!
In Fly Tying by Mcflyangler (Frusso replied)