Name this mayfly

[Cowlitz Bottomfeeder]

Photographed on the Cowlitz this morning by Mike Sturza. Quite large as I recall about #12. Coloration yellow to chartreuse.

 

[SculpinSwinger]

Looks like what I saw May 12 in the southern end of the Willamette Valley
The wind blew its wings off center

 

[Cabezon]

Pale evening dun (see here)???
Steve

 

[kmudgn]

I would normally guess PMD, or PED, but the eye color seems wrong and the wings are much more opaque and yellow than I would expect. I don't know about the size, or when the photo was taken, but I suspect it could be a Hex fly as well

 

[Zak]

I'd call that a sulfur.

 

[FinLuver]

One early June evening, I drove over the I-5/ N Umpqua bridge. The hatch was thick, I had all windows down including moon roof. It took quite a bit of washer fluid to get that gunk off the window; even brought a couple home with me. What a sight…!

 

[Cowlitz Bottomfeeder]

I would normally guess PMD, or PED, but the eye color seems wrong and the wings are much more opaque and yellow than I would expect. I don't know about the size, or when the photo was taken, but I suspect it could be a Hex fly as well

Ive seen #16-18 PMD’s in Montana. And they were Pale. As i mentioned, these are bright yellow or charteuse and #12. Also, PMD’s have a light gray wing. These are yellow.

 

[RCF]

@Taxon - can you help?

 

[James St. Clair]

I would guess an Epeorus sp. Not sure which one, but I have seen similar on the Yak this time of year.

 

[Pink Nighty]

Yellow Sally #12, hell it's probably a #10 Yellow Stimulator if it's all you got in the box

 

[Cowlitz Bottomfeeder]

Yellow Sally #12, hell it's probably a #10 Yellow Stimulator if it's all you got in the box

Wrong guess, Pilgrim. A yellow sally is a stonefly.

 

[rattlesnake]

I think that’s a potamanthus

 

[Cowlitz Bottomfeeder]

I think that’s a potamanthus

Looks good but the range says UK and northern Asia

 

[SculpinSwinger]

Heptagenia Solitaria?

 

[Cowlitz Bottomfeeder]

Heptagenia Solitaria?View attachment 185500

That looks like a match. Does the range match?

 

[Yard Sale]

Alex


What do I win?

 

[RCF]

Atlantic salmon.

What do i win?

 

[SculpinSwinger]

That looks like a match. Does the range match?

My resources don’t cover the range of this PED, but the book that pic is from covers the insect population of the McKenzie river in Oregon specifically.
Another pic from the book,

 

[Taxon]

Photographed on the Cowlitz this morning by Mike Sturza. Quite large as I recall about #12. Coloration yellow to chartreuse.View attachment 185417

I believe this male subimago of family Heptageniidae, and to (probably) be Cinygma dimicki. If I am correct, then its common name would be Western Light Cahill.

 

[Coho]

Photographed on the Cowlitz this morning by Mike Sturza. Quite large as I recall about #12. Coloration yellow to chartreuse.View attachment 185417

Hexagenia Limbata!