Credit Island, Davenport, Scott County, Iowa, USA September 15, 2011 Size: ~9 mm BL
These very small mayflies were very numerous resting on the surface of near-shore water along a large island in the Mississippi River.
Contributed by John Pearson on 15 September, 2011 - 10:41pm Last updated 21 July, 2014 - 8:35am
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