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Photo#423421
Backswimmer - Notonecta kirbyi

Backswimmer - Notonecta kirbyi
1/2 mile north of Westwood , Lassen County, California, USA
July 8, 2008
Size: Body length 14mm
Found in a puddle of a small stream that was drying up.

Moved
Moved from Notonecta.

This is California's largest notonectid. The color pattern is variable, but usually similar to this one. Sometimes with more red. If you still have the specimen, flip it over and you'll see that the keel of the 4th abodominal sternite has the hairs restricted to the sides, leaving the middle bare. There are other CA Notonecta with this character, but none likely in your area.

 
Thanks Brady...
... for ID'ing this critter for me; and thanks for the interesting comments. If I still have the specimen (probably mothballed out in the garage somewhere) I will photograph the underside and post it here for reference.

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