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> > Gumaga sp.

Millcreek has attached these 6 pictures to aid in identification. The message is below.
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Larvae are 10 mm. Cases 11 mm.
Larvae are 10 mm. Cases 11 mm.
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Larvae are 10 mm. Cases 11 mm.
Larvae are 10 mm. Cases 11 mm.
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Larvae are 10 mm.
Larvae are 10 mm.
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Larvae are 10 mm. Cases 11 mm.
Larvae are 10 mm. Cases 11 mm.
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Larvae are 10 mm.
Larvae are 10 mm.
Shown Full Size
Larvae are 10 mm.
Larvae are 10 mm.
MillcreekFebruary 16th, 2015, 11:22 am
Healdsburg, CA

Posts: 356
This larvae is common to Mill Creek, a tributary of the Russian River. Haven't found it in the river yet, but it's seasonally common in the stream. Keyed it out to genus in Merritt, Cummins and Berg (2008). Curious as to species. Any help would be appreciated.
PaulRobertsFebruary 16th, 2015, 6:59 pm
Colorado

Posts: 1776
Pretty thing.
GutcutterFebruary 17th, 2015, 8:26 am
Pennsylvania

Posts: 470
Does anybody know how they make that type of case?
Very cool.
Some amazing engineering.
All men who fish may in turn be divided into two parts: those who fish for trout and those who don't. Trout fishermen are a race apart: they are a dedicated crew- indolent, improvident, and quietly mad.

-Robert Traver, Trout Madness
TaxonFebruary 17th, 2015, 11:14 am
Site Editor
Plano, TX

Posts: 1337
Hi Tony-

Does anybody know how they make that type of case?


Caddisfly larvae use a mouthpart gland which extrudes silk as a binding agent to build their cases.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
CrenoFebruary 17th, 2015, 12:43 pm
Grants Pass, OR

Posts: 305
Gumaga is a great taxa to initiate a discussion of the species concept. There are numerous publications from the Resh Lab involving Gumaga "species". (http://nature.berkeley.edu/reshlab/) Ya probably should start with Jackson and Resh 1998. (Jackson, John K., Resh, Vincent H. 1998. Morphologically cryptic species confound ecological studies of the caddisfly genus Gumaga (Trichoptera: Sericostomatidae) in northern California. Aquatic Insects 20: 69-84.)

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