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early-season stonefly

early-season stonefly
Lower Dam, Winneshiek County, Iowa, USA
March 21, 2021
Size: ~15 mm
There were a number of these stoneflies emerging from the Upper Iowa River on a warm sunny day. I'm not sure if the photos can determine its identity past just a stonefly but I thought I'd try.

Images of this individual: tag all
early-season stonefly early-season stonefly

Moved from Stoneflies.

This family can be separated from the other "winter" or spring emerging stoneflies by the relative lengths of the tarsal segments. The first and second segments roughly equal in length for Taeniopterygidae, while the second segment is shorter and wedge-shaped for the other families.

Thanks so much for identifying this stonefly down to the Family Taeniopterygidae, Brady! I really appreciate your comments about how to tell Taeniopterygidae from other springtime stoneflies by checking out the length of their first and second tarsal segments since I did not know this. That information will be very helpful to me in the future.

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