Dublin Canyon, near Castro Valley, Alameda County, California, USA May 9, 2007 Size: 30 - 40 mm
I found this in the middle of the night in an ephemeral drainage in oak-bay woodland with dense canopy cover. It was in about an inch of water in a small pool in the mostly dry stream. I've reviewed a few drawings in books and the closest resemblance I've seen is of a Hydrophilid larva, though an adult of whatever this is would be much larger than any of the other invertebrates I saw in the stream that night.
Can anyone who's up on their immatures weigh in on this one?
Contributed by Dana Terry on 10 May, 2007 - 11:59pm Last updated 19 June, 2007 - 5:51pm
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