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

> > Chimarra larvae and pupae



Millcreek has attached these 15 pictures to aid in identification. The message is below.
View Full SizeView Full Size (1.3X larger)
Larva 9 mm. August 16, 2014.
Larva 9 mm. August 16, 2014.
View Full SizeView Full Size (3.2X larger)
Larvae 8 mm. August 16, 2014.
Larvae 8 mm. August 16, 2014.
View Full SizeView Full Size (1.1X larger)
Prepupa. Case 10 mm, prepupa 8 mm. August 16, 2014. Live specimen.
Prepupa. Case 10 mm, prepupa 8 mm. August 16, 2014. Live specimen.
View Full SizeView Full Size (1.4X larger)
Dorsal view, case of early pupa. 10 mm. August 16, 2014.
Dorsal view, case of early pupa. 10 mm. August 16, 2014.
View Full SizeView Full Size (1.2X larger)
Ventral view, case of early pupa. Case 10 mm. Pupa 8.5 mm. August 16, 2014. Live specimen.
Ventral view, case of early pupa. Case 10 mm. Pupa 8.5 mm. August 16, 2014. Live specimen.
View Full SizeView Full Size (1.2X larger)
Dorsal view of early pupa from case above. In alcohol. Coloring about the same as live specimen. August 16, 2014.
Dorsal view of early pupa from case above. In alcohol. Coloring about the same as live specimen. August 16, 2014.
View Full SizeView Full Size (1.1X larger)
Ventral view of specimen above. August 16, 2014. In alcohol.
Ventral view of specimen above. August 16, 2014. In alcohol.
View Full SizeView Full Size (1.2X larger)
Lateral view of specimen above.August 16, 2014. In alcohol.
Lateral view of specimen above.August 16, 2014. In alcohol.
View Full SizeView Full Size (1.2X larger)
Another early pupal case. Dorsal view. Case 10 mm. August 16, 2014.
Another early pupal case. Dorsal view. Case 10 mm. August 16, 2014.
View Full SizeView Full Size (1.6X larger)
Ventral view of case above. Pupa 8 mm. August 16, 2014. Live specimen.
Ventral view of case above. Pupa 8 mm. August 16, 2014. Live specimen.
View Full SizeView Full Size (1.4X larger)
Dorsal view. Case of mature pupa. Case 10 mm. August 16, 2014.
Dorsal view. Case of mature pupa. Case 10 mm. August 16, 2014.
View Full SizeView Full Size (1.3X larger)
Ventral view of case above. Pupa 8 mm. August 16, 2014. Live specimen.
Ventral view of case above. Pupa 8 mm. August 16, 2014. Live specimen.
Shown Full Size
Pupa from case above. Lateral view. August 16, 2014. In alcohol.
Pupa from case above. Lateral view. August 16, 2014. In alcohol.
Shown Full Size
Pupa from case above. Ventral view. August 16, 2014. In alcohol.
Pupa from case above. Ventral view. August 16, 2014. In alcohol.
Shown Full Size
Pupa from case above. Dorsal view. August 16, 2014. In alcohol.
Pupa from case above. Dorsal view. August 16, 2014. In alcohol.
MillcreekAugust 16th, 2014, 8:20 pm
Healdsburg, CA

Posts: 356
There's been a fairly large emergence of Chimarra here over the last few days so I thought I'd try and document some of the larval and pupal stages. The larvae were identified to genus using Merritt. Cummins and Berg (2008). Pupae were identified to family with MCB. Association between larvae and pupae was done by identifying the prepupa as Chimarra using the extension on the forecoxa and the asymmetrical notch at the front of the head. Pupae were associated by the same features in the sclerites contained in the pupal cocoon. Don't know the species. I've collected some adults but haven't gotten around to attempting to identify them to species.

Anyway, here's way more photos than you probably want to see.
EntomanAugust 16th, 2014, 11:47 pm
Northern CA & ID

Posts: 2604
Never too many photos, Mark! :) Your pupa photos are the best I've seen of these little guys...

Look for a projection on the clasper's dorsal margin. My suspicion is there is one, which would point to C. utahensis. I believe it's the only species I've run into on our trout waters out here. They're very common in many places but rarely (if ever) important in my experience. This time of year you can bust them out of the damp riparian bushes at the margins, but never seem to see them on the water.
"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
LastchanceAugust 17th, 2014, 7:43 am
Portage, PA

Posts: 437
I really enjoy all of the great photographs on this site. They are very helpful.
MillcreekAugust 17th, 2014, 10:16 am
Healdsburg, CA

Posts: 356
Kurt - I'll Keep C. utahensis in mind when I check out the adults. Don Burdick's site has some great illustrations of Trichoptera genitalia drawn by Shannon Bickford which include several species of Chimarra from California. Whichever species they are you're right about them being very common. The adults are thick on streamside bushes right now, especially in the early morning. I've netted them low on the water in the evening, mostly females so I suspect they're in the process of laying eggs. Seems like fish would take advantage of them in the larval stage if they're part of the drift and I imagine the pupae would be vulnerable when they emerge but it would probably just be luck to happen upon them then.

As to the photos, they could be better, the pupae seem to be either too light or to dark (depending on the developmental stage) to get really good detail. I'm going to have to fiddle with lighting. I usually just photograph them in natural light (something there's usually plenty of in California).

Bruce - Looks like a sulphur to me.

EntomanAugust 17th, 2014, 10:33 am
Northern CA & ID

Posts: 2604
Low on the water or low over the water? I've observed the latter many times but don't remember the former. As for the pupae, you may be right. Small dark attractor nymphs are as effective as anything else this time of year when nothing else is going on. My suspicion is they trickle off most of the day rather than engaging in mass emergencies that would tend to get the fish honing in on them. They are usually competing with other species for Mr. Trout's attention as well which is another important factor. Out West the Spotted Sedges, late Grannoms, Saddle Case larvae and a few others usually take center stage.
"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
MillcreekAugust 17th, 2014, 10:47 am
Healdsburg, CA

Posts: 356
Low on the water or low over the water?


Low over the water. I've never seen them on the water.
MartinlfAugust 19th, 2014, 12:27 am
Moderator
Palmyra PA

Posts: 3233
Gorgeous photos! Thanks.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Feathers5August 19th, 2014, 8:49 am
Posts: 287I bet an imitation wax worm would do the trick for these guys.
MillcreekAugust 25th, 2014, 1:00 pm
Healdsburg, CA

Posts: 356
Louis-
Gorgeous photos! Thanks.

Glad you enjoyed them.

Feathers5-
I bet an imitation wax worm would do the trick for these guys.

I think it might work well providing the size and coloration were right. Actually, those might work well imitating a lot of caddisfly pupae.

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: Ochrotrichia tenuata
(2 more)

In the Photography Board by Millcreek
1May 10, 2015
by PaulRoberts
Onocosmoecus larvae and cases
(3 more)

In the Photography Board by Millcreek
0
Re: Help identifying?
In the Identify This! Board by Doublezz105
3Jul 9, 2007
by Taxon
Re: Caddis: without case
In the Identify This! Board by Dryfly
4Mar 20, 2007
by GONZO
Capnia umpqua
(2 more)

In the Photography Board by Millcreek
0
Re: please help.what larvae is this
In the Identify This! Board by Alvin
2Apr 7, 2012
by Crepuscular
Re: Hydropsychid?
In Hydropsyche Caddisfly Pupa by GONZO
14May 7, 2009
by LittleJ
Re: Neophylax larvae and pupae
(9 more)

In the Photography Board by Millcreek
3Nov 27, 2014
by Millcreek
Re: Apatania larvae and pupae
In the Photography Board by Millcreek
3Feb 22, 2016
by PaulRoberts
Re: Interesting clinger species
In the Identify This! Board by CalebBoyle
7Mar 31, 2007
by GONZO
Most Recent Posts
Re: large free living caddis rhyacophila?
In the Identify This! Board by Kjfeen (Taxon replied)