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Lyrae has attached this picture to aid in identification. The message is below.
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LyraeMay 13th, 2007, 7:12 pm
French Creek, PA

Posts: 1
I saw this on my deck this evening. Anyone have any ideas? I only know enough to catch a few fish :)



Thanks.
GONZOMay 13th, 2007, 7:48 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Lyrae,

Cool mayfly! I can't make out some of the details, but from the overall appearance it looks like a female Siphlonurus spinner to me.
TaxonMay 13th, 2007, 8:03 pm
Site Editor
Plano, TX

Posts: 1314
That was my impression as well, also a female spinner. I'm thinking Siphlonurus alternatus. Don't see any Siphlonurus species listed for PA in my most trusted (national) source. However it's most likely incomplete in that regard.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
GONZOMay 13th, 2007, 8:19 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Roger,

I can confirm that we do have Siphlonurus in PA. I've seen and even fished them on a few streams. Greg Hoover's 2002 survey of PA mayflies lists barbaroides, mirus, quebecensis, rapidus, and typicus as PA species.
TaxonMay 13th, 2007, 8:35 pm
Site Editor
Plano, TX

Posts: 1314
Gonzo-

Well, we seem to be in violent agreement on genus. And after all, identification to species based on a photograph of a female imago is problematic, at best. However, as Konchu has observed, it is fun.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
GONZOMay 13th, 2007, 8:54 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Agreed, Roger, it is fun to guess. I was tempted to guess quebecensis, but the only species I can reasonably rule out is mirus.

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