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Male Siphlonurus occidentalis (Gray Drake) Mayfly Spinner Pictures



 This specimen was easy to key to species using the old keys in < id="115" />, and was the basis for IDs of several other Siphlonurus specimens of the same species collected on the same day.

This mayfly was collected from the Henry's Fork of the Snake River on July 31st, 2020 and added to Troutnut.com on August 16th, 2020.


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