Aquatic Insect #7 ID?

This aquatic insect is mostly found in WA lakes. Can you identify it by any of the following?

Lifestage:
Order common name:
Order taxonomic name:
Family common name:
Family taxonomic name:
Genus taxonomic name:

Hi Travis,

Not a spinner; notice the non-wettable hairs (barely) visible on the trailing edge of its forewing. Neither family Leptohyphidae, nor genus Tricorythodes; close, but no cigar.

IDENTIFICATIONS

Lifestage:
Order common name:
Order taxonomic name: Ephemeroptera (Travis Bille)
Family common name:
Family taxonomic name:
Genus taxonomic name:

Hi Jay,

Yes, I "believe" it to be a female dun.

IDENTIFICATIONS

Lifestage: subimago/dun (jwg)
Order common name:
Order taxonomic name: Ephemeroptera (Travis Bille)
Family common name:
Family taxonomic name:
Genus taxonomic name:
Gender: female (jwg)

Yes Jay, the female mayfly subimago and imago generally has smaller eyes than their male counterparts, and can be differentiated from them on that basis, particularly from a lateral view photo.

Hi Bob,

Welcome aboard, and well done. However, Caenidae is actually the taxonomic name of the family, not the genus.

IDENTIFICATIONS

Lifestage: subimago/dun (jwg)
Order common name: ???
Order taxonomic name: Ephemeroptera (Travis Bille)
Family common name: ???
Family taxonomic name: Caenidae (Bob Newman)
Genus taxonomic name: ???
Gender: female (jwg)

Good cleanup, Jay.

IDENTIFICATIONS

Lifestage: subimago/dun (jwg)
Order common name: Mayflies (jwg)
Order taxonomic name: Ephemeroptera (Travis Bille)
Family common name: Small Squaregill Mayflies (jwg)
Family taxonomic name: Caenidae (Bob Newman)
Genus taxonomic name: ???
Gender: female (jwg)

Welcome aboard, Etamaman. Although this mayfly does have three tails in its dun and spinner lifestages, a trait it does shares with Ephemerrelids (members of family Ephemerellidae), if you look a the wings, you will notice that this mayfly doesn't have hind wings, and all Ephemerellids (including genus Ephemerella) do have hind wings.

Good job, Jay.

IDENTIFICATIONS

Lifestage: subimago/dun (jwg)
Order common name: Mayflies (jwg)
Order taxonomic name: Ephemeroptera (Travis Bille)
Family common name: Small Squaregill Mayflies (jwg)
Family taxonomic name: Caenidae (Bob Newman)
Genus common name: Whitewinged Sulphur (jwg)
Genus taxonomic name: Caenis (jwg)
Gender: female (jwg)

tkww-

Caenis mayflies live in both lakes and streams. However, I have only encountered them once. It was many years ago at Dry Falls Lake. My fishing partner and I had returned his vehicle. This was at dusk, and we discovered tiny mayflies on the vehicle's vertical surfaces. Within seconds of landing, the dun would start shedding its skin. The process appeared to take less than a minute, following which. the spinner would fly off, often with its shed exoskeleton still partially attached at the tails.

In any event, this was in the very early stages of my entomology self-education, and I wasn't even sure what kind of mayflies they were. However, I collected several in plastic sandwich bag, and was able to identify them after returning home, and being able to view them with adequate lighting and 10x magnification. They are really tiny, only about 3 mm in body length.