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Photo#916055
 Ochrotrichia tenuata - voucher specimens, in alcohol - Ochrotrichia tenuata

Ochrotrichia tenuata - voucher specimens, in alcohol - Ochrotrichia tenuata
Healdsburg, Russian River, Sonoma County, California, USA
May 3, 2014
I included several specimens in this series of photos to show some variations in the cases. Rather than do each specimen individually and direct viewers to other photos I opted for this.
Cases may or may not have ballast stones attached, more than half of the ones I collected do have ballast stones. The stones can be on the top or bottom of the case and are attached with silk. The larvae were found in an area of moderate current on algae (Cladophora sp.) attached to cobbles. I can't find any reference to this genus using ballast stones. Does anyone know anything about this? The larvae pictured were 3 - 3.5 mm long, the cases were 3 - 4 mm in length and the ballast stones were 2 - 3 mm across. I also found some pupal cases approximately 4 mm in length attached directly to cobbles and attached at each end with silk. None of the pupal cases had ballast stones attached.

Images of this individual: tag all
 Ochrotrichia tenuata - voucher specimens, in alcohol - Ochrotrichia tenuata  Ochrotrichia tenuata - voucher specimens, in alcohol - Ochrotrichia tenuata  Ochrotrichia tenuata  - voucher specimens, in alcohol - Ochrotrichia tenuata  Ochrotrichia tenuata - voucher specimens, in alcohol - Ochrotrichia tenuata

Moved
Moved from Hydroptilinae.

 
O. tenuata
Brady, Thanks for creating the page.

ballast stones
Interesting, I have not seen this before. I am not entirely convinced these are Ochrotrichia. I have never seen Ochrotrichia with an algal case, and the meso/metanotal plates don't look right. Did you compare to Nothotrichia? [KATHERINE A. PARYS & STEVEN C. HARRIS 2013, Larva of Nothotrichia shasta Harris & Armitage (Trichoptera: Hydroptilidae) from California, USA, with its phylogenetic and taxonomic implications. Zootaxa 3620(4):589–595)] N.shasta have algal cases although Eurasian Nothotrichia are known to have sand pupal cases.

 
Thanks, Dave
I think you may have something there. I keyed these out using Merritt, Cummins and Berg but at the time of printing (2008) there was no description of the larvae of Nothotrichia. I've downloaded the paper by Parys and Harris and skimmed it. Looks promising. I'm headed to the river right now but will read the paper this afternoon or evening and see whether or not it ties in with the larvae I collected. I agree the meso/metanotal plates don't look quite right but I thought it might be a regional variation. Guess that's why I shouldn't make assumptions. Thanks again.

 
Nothotrichia
Read the paper by Parys and Harris. These specimens key out to Nothotrichia using their amendment to Wiggins' key. No mention of ballast stones in the article however. Found more pupal cases today and some of those have ballast stones still attached. Changed genus to Nothotrichia.

 
Ochrotrichia tenuata
So after going through Nothotrichia, Metrichia and Ochrotrichia an identification has been made from male pupae whose genitals were developed enough to determine the species. Thanks to Dave Ruiter they have been identified as Ochrotrichia tenuata.

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