I was surprised by the olive cast on the body of this female Rhithrogena dun, which led me to mistake it for a western green drake (Drunella) in the field. I was pleasantly surprised to get a closer look and find something I hadn't collected yet. Its species ID is based on proximity to male spinner collected on the same trip, as well as physical similarity (size, tergite (Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) coloration, dark streaks on the femora (Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.)) to that specimen.
This mayfly was collected from Mystery Creek #249 on July 4th, 2020 and added to Troutnut.com on July 12th, 2020.
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