Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada
nymphs, a revision of the Nemouridae
family by Baumann (1975)
includes the following helpful sentence: "2 cervical gills
on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites
, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes
." This specimen clearly has the branches and is within the range of that species.