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Photo#1942733
Maccaffertium maybe? - Maccaffertium mediopunctatum - male

Maccaffertium maybe? - Maccaffertium mediopunctatum - Male
Chimney Rock Park, Winneshiek County, Iowa, USA
May 27, 2020
I compared this male mayfly to an example in my photo files of a male Maccaffertium mediopunctatum and they look identical to me. Interestingly, I had photographed the male Maccaffertium mediopunctatum two days later (05/29/2020) than this individual but along a different river. If this turns out to be Maccaffertium mediopunctatum, then this species is found in both the Upper Iowa River and Turkey River here in Iowa.

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Maccaffertium maybe? - Maccaffertium mediopunctatum - male Maccaffertium maybe? - Maccaffertium mediopunctatum - male Maccaffertium maybe? - Maccaffertium mediopunctatum - male

Moved
Moved from Mayflies.

Maccaffertium mediopunctatum mediopunctatum
Hi Larry-

Yes, I believe this male subimago to be Maccaffertium mediopunctatum mediopunctatum.

 
Maccaffertium mediopunctatum mediopunctatum
Thanks so much for confirming that this mayfly is a male subimago Maccaffertium mediopunctatum mediopunctatum, Roger! I thought he might be a subimago with those pale yellow wings but I wasn't sure, so I really appreciate your help with that too. It's interesting to note that Maccaffertium mediopunctatum mediopunctatum was emerging from two different river systems at exactly the same time of year.

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