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As shown in my WA Aquatic Insect Emergence Chart, Siphlonurus mayflies can be present in both Move and Still waters. However, I believe the greater likelihood would be that they spent their nymphal lifestage in the lake, emerged from it as subimagos, and returned to it as imagos in order to mate.

Hi Tom- I believe your mayfly image to be of genus Siphlonurus. Please see WA Mayfly Description.

Hi Curt- Just discovered your post. Can't really add anything of value regarding your and others observations, nor to Mark's analysis, other than to agree with everything that has already been said.

One of my online favorites is Guide to Aquatic Macroinvertebrates of the Upper Midwest

Perhaps you mean Simplonurus mayflieus which at least in proper binomial form. ;)

Thanks for the heads up, Mark. My distribution maps for both Anafroptilum bifurcatum and Anafroptilum conturbatum have now been updated. :)

Hi Mark- I believe there is actually at least one Anafroptilum species present in Idaho. Please see Anafroptilum bifurcatum.

They are harmless. Those are tusks for digging, as opposed to mouthparts for pinching.

Bingo.

Hi Billy- I also believe this female imago to be Hexagenia limbata. At one time, taxonomists believed there were numerous separate species, which included: Hexagenia affiliata McDunnough, 1927 Hexagenia californica Upholt, 1937 Hexagenia carolina Traver, 1931 Hexagenia elegans Traver, 1931...

Initially, I too was preserving collected (nymphal and larva) specimens in bottles. However, I eventually transitioned to simply taking microscopic photos of them, and then returning them (still alive) to the water in which they were collected.

Hi Zak- Yes, I believe it to be a female subimago of Callibaetis ferrugineus hageni.

Hi Mark- Likely Hexagenia limbata, as Hexagenia rigida has not been recorded in a scientific paper as being present in New Hampshire.;)

Have only been to Hurricane Ridge Day Lodge one time. Can't remember much about the occasion, other than that when we went into the cafe and had been seated, we saw Gov. Dan Evans and his (7 or 8 year old) son walk in. That made quite an impression on this early teenager. ;)

Your modesty is most admirable, the difference between good and incredible notwithstanding. ;)

Hi Mark- I sincerely believe you are the most talented aquatic macro-invertebrate photographer on this planet.

Hi (tkww and Tom Butler)- Please post your (above) excellent images to BugGuide ID Request so I can identify & move them to their proper placement in the guide.

BINGO

Hi tkww- Yes, I believe this male imago to be Ameletus vernalis. Which SE WA county is it from?

Aquatic insects undergo either incomplete metamorphosis or complete metamorphosis. Incomplete metamorphosis has (3) lifestages, which are commonly referred to as egg, nymph, and adult. Complete metamorphosis has (4) lifestages, which are commonly referred to as egg, larva, pupa, and adult. Of...