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Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Dun Pictures

 This specimen emerged indoors from nymphs I had collected, then partly molted into a spinner but got stuck along the way. I've included a couple pictures showing some of the spinner colors. It got a bit waterlogged after emerging, so the wings aren't in perfect shape, but it still represents one of two Baetids that were emerging and drawing trout to rise on the Yakima. Based on body size and shape, it is most likely the same species as this nymph.

This mayfly was collected from the Yakima River on September 12th, 2020 and added to on September 19th, 2020.

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