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Mayfly - Eurylophella prudentalis - male

Mayfly - Eurylophella prudentalis - Male
Groton, Middlesex County, Massachusetts, USA
June 8, 2008

Moved from Eurylophella.

Thanks Lloyd
I wonder if this is an E. prudentalis.

Could be...
I can't see anything that would rule out prudentalis, but a close examination of the genitalia of a male imago would be conclusive. This seems like a good match for your female subimago placed in that species. We had previously guessed that these might be making their way to your house from the Nashua. All of the Eurylophella nymphs that you collected from there were identified by DSC as prudentalis. Some guesswork, to be sure, but it seems reasonable to me.

Missing a "tail"
Looks like a male Eurylophella subimago. Orange eyes, brown body, yellowish legs, dark wings, and banded tails are pretty typical of most Eurylophella "duns," but the long 9th abdominal segment is probably the easiest way to separate these from other Ephemerellidae.

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