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Stonefly Species Skwala curvata (Large Springfly)

Pictures Below
This species is virtually identical in appearance to Skwala americana. Telling them apart is usually only possible by comparing genitalia. See the Skwala genus page for detailed information.

Pictures of 1 Stonefly Specimen in the Species Skwala curvata:

Female Skwala curvata (Large Springfly) Stonefly AdultFemale Skwala curvata (Large Springfly) Stonefly Adult View 2 PicturesThis female dropped her eggs just before this photo was snapped. The distinctive notch in the subgenital plate identifies the species. An interesting observation is how active they get when exposed to direct sunlight. Trying to stage this specimen was most difficult. In the shade it would calm right down, but when exposed to direct sun it would immediately go nuts, scampering all over quickly without pause. Perhaps this explains why they don't seem to be found out and about on overcast days, but if the sun peeks out... She was 24 mm long, head to wingtip.
Collected March 22, 2013 from the Lower Yuba River in CA
Added to Troutnut.com by Entoman on March 27, 2013

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