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Rhithrogena hageni (Western Black Quill) Mayfly Nymph Pictures

 I'm basing the ID of this near-mature nymph on a male spinner with similar size and markings, collected on the same trip. There isn't a key to reliably identify the nymphs of most Rhithrogena species otherwise.

This mayfly was collected from Mystery Creek #249 on July 4th, 2020 and added to on July 12th, 2020.

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