Attenella margarita nymph - Attenella margarita
~12 miles east of Tillamook, Tillamook County, Oregon, USA
June 14, 2016
Size: 3.5mm excluding tails
This species has small, blunt paired tubercles on the abdominal segments that are hard to even see in this photo. The specimen was collected just upstream of a small dam on the East Fork of the South Fork Trask River that has now been removed.