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Stonefly - Skwala

Stonefly - Skwala
Puyallup, Pierce County, Washington, USA
March 15, 2009
Size: *21 mm
Found near the Puyallup River. *Measurement is from tip of head to tip of wings, so not quite accurate.

Thanks Lloyd.

Perlodidae, but...
it looks like Skwala to me, and the timing is right.

S. americana?
This site suggests that it might be americana instead of curvata. I can't seem to find any images of curvata, but I found maps that put it in ID and MT.

Could be...
but I'm not familiar with the appearance of curvata adults. As far as I know, both are found in MT, though americana seems to be the more common and widespread of the two.

maps here
suggest both are found in MT, but only americana is found in Western WA.


Sorry, Lynette...
I wasn't paying attention to the location. I'm accustomed to your specimens being from MT. (Did you move?) The state codes listed on the North American Stonefly List (maintained by Stark and Baumann) indicate that both species are also recorded for WA (WN on that list).

Although all distribution records have inevitable limitations, I find that the distribution lists on Roger Rohrbeck's website are very convenient and generally more complete and up-to-date than the USGS site.

I'll add that site to my favorites. I did move, and have been here in WA over a year now. I will still visit MT in the summers, though. I have more fun hunting in MT, since I think I'm the only bugguide photographer from that state (no wait Jim Urbach has visited MT as well).

Cultus sp?
There's a picture on pg. 55 of Insects Their Natural History and Diversity that looks a lot like this one.

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