Isoperla marmorata

[Mark Melton]

These nymphs were found in the Russian River in shallow fast water. They're most common from late January to mid April. They run around 13 - 15mm not including cerci or antennae. The nymphs were identified using this article, the description starts on page 28 and the photos on page 30.
http://www2.pms-lj.si/illiesia/papers/Illiesia07-22.pdf

 

[FinLuver]

That’s a handsome nymph…!!

 

[tkww]

That's wild!