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mayfly - Eurylophella prudentalis - female

mayfly - Eurylophella prudentalis - Female
Groton, Middlesex County, Massachusetts, USA
June 28, 2007

The Nashua River does come to within a mile from the house, and the Squanacook River is just over a mile in the other direction.

I thought that might be the case with regard to your location. I'm really not sure what to suggest regarding the species ID. Although it does seem likely to me, I can neither prove nor disprove the identity at that level. David Funk has vastly more familiarity and expertise with these than an amateur hack like me ever will. It would be nice if he could look at your specimens.

The nymphs that Don identified were about 10 miles away, and found in the Nashua River. This one came to the porch light and we have a swampy wetland out back.

Boy, are my wings tired
Tom, a swampy wetland doesn't sound like the best habitat for Eurylophella, even though they are sometimes found in lakes. It's possible that this specimen (like your male) came from the Nashua. Are you closer in "air miles" to some part of it?

I can't see anything that is inconsistent with an E. prudentalis ID--dark color, yellowish legs, lateral projections on the abdomen, fine brown bands on the tails, and small dark spots on the coxae. However, I don't know if other Eurylophella species might be found in your area that share those traits.

Eurylophella (?)
I suspect that this might be the female subimago that goes with your male subimago (here). Were the nymphs that Don Chandler identified as Eurylophella prudentalis collected from the same location?

Moved from Mayflies.

This is surely an ephemerellid, but it is a female subimago and not a familiar species for me.

Mayfly Subimago
Note the smoky wings, which indicates that this specimen has yet to moult into a clear-winged reproductive (imago).

Mayflies are different
given that after they emerge from the larval stage, they still have to molt one more time.

As I recall...
I think Odes do that too, no? Or, at least they change color or something like that

Odes darken with age
When they emerge, they're almost colorless. Some immature adult males like the pondhawks start off with the same colors as the females.

That's what I had expected ... I should have thought twice before asking . Thanks for the clarification though :-)

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