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Male Rhithrogena Mayfly Spinner Pictures

This mayfly was collected from the Ruby River on July 8th, 2019 and added to on July 18th, 2019.

Recent Discussions of this Spinner

Puzzled on this mayfly, not even confident on family 1 Reply »
Posted by Troutnut on Jul 23, 2019
Last reply on Jul 23, 2019 by Millcreek
This seems to be some sort of Heptageniid, based on the two tails and five segments on the hind tarsus. Following the key in Merritt & Cummins seems to lead to Rhithrogena, but it doesn't fit a characteristic described in Needham's Biology of Mayflies for that genus: "Tibia of hind leg in both sexes about 1/4 length of femur."

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