Aquatic Insect #14 ID?

Discussion in 'Fly Fishing Entomology' started by Taxon, Oct 3, 2012.

  1. Taxon Moderator

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    [IMG]

    Can you identify this aquatic insect by any of the following?

    Order common name
    Order taxonomic name
    Family common name
    Family taxonomic name
    Genus common name
    Genus taxonomic name
    Lifestage
  2. Gary Knowels Active Member

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    Mayfly, ephemeroptera, nymph

    And I'll guess hexagenia

    Sent from my SGH-T679 using Tapatalk 2
  3. Taxon Moderator

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    Hi Gary-

    Mayfly, ephemeroptera, nymph are correct. However, Hexagenia nymphs are burrowers. Please see Mayfly Behavioral Categories.

    IDENTIFICATIONS

    Order common name: Mayfly (Gary Knowels)
    Order taxonomic name: Ephemeroptera (Gary Knowels)
    Family common name: ???
    Family taxonomic name: ???
    Genus common name: ???
    Genus taxonomic name: ???
    Lifestage: Nymph (Gary Knowels)
  4. jwg Active Member

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    Looks like a clinger to me.

    Which would put it in rivers.

    I see three tails.

    That would narrow it down to about 15 genera in the pacific nw.

    This could be tough.

    Jay
  5. Taxon Moderator

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    Hi Jay-

    Fair enough. It was photographed in early September in King County from the Cedar River.
  6. Gary Knowels Active Member

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    Heptageniidae?
  7. Taxon Moderator

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    Hi Gary-

    Sure is.

    IDENTIFICATIONS

    Order common name: Mayfly (Gary Knowels)
    Order taxonomic name: Ephemeroptera (Gary Knowels)
    Family common name: ???
    Family taxonomic name: Heptageniidae (Gary Knowels)
    Genus common name: ???
    Genus taxonomic name: ???
    Lifestage: Nymph (Gary Knowels)
  8. Travis Bille Active Member

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    Would that make the common family name the "flathead mayflies"
  9. Taxon Moderator

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    Sure would.

    IDENTIFICATIONS

    Order common name: Mayfly (Gary Knowels)
    Order taxonomic name: Ephemeroptera (Gary Knowels)
    Family common name: Flatheaded Mayflies (Travis Bille)
    Family taxonomic name: Heptageniidae (Gary Knowels)
    Genus common name: ???
    Genus taxonomic name: ???
    Lifestage: Nymph (Gary Knowels)
  10. kelvin Active Member

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    Ephemerella dorothea dorothea ?
  11. Taxon Moderator

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    Hi Kelvin-

    Welcome to the Flyfishing Entomology subforum, and congratulations on having the courage to get your feet wet. However, genus Ephemerella is in family Ephemerellidae (Spiny Crawler Mayflies), whereas this mayfly is in family Heptageniide (Flatheaded Mayflies).
  12. kelvin Active Member

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    What is Rhithrogena for 200 ?
  13. Gary Knowels Active Member

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    Ecdyonursus simplicioides, Pale Western Cahill?

    Info from Nymphs Volume I: The Mayflies by Schwiebert
  14. jwg Active Member

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  15. Taxon Moderator

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    Hi Kelvin, Gary, and Jay-

    Yes, as Jay (and maybe Gary) cleverly discovered, I also believe this mayfly to be of genus Ecdyonurus. However, as my opinion is not infallible, in an attempt to avoid making an erroneous identification here on the Flyfishing Entomology Subfrom (in my own backyard, so-to-speak), I emailed a practicing professional entomologist with whom I've had previous contact, and requested a second opinion. Have not yet heard back from him.

    As Jay accurately points out, my Adult Mayfly Identification query does not list genus Ecdyonurus. The query was developed in February of 2004, and at the time, I did not have access to all of the required attributes of genus Ecdyonurus adults, so they was not included in the query.

    However in May of 2009, I developed N. American Mayfly Species Query. This is a much more powerful and sophisticated query. It lists all mayfly species (or subspecies) recognized by Mayfly Central. In addition, it allows searching on (and selective listing of) taxonomic and descriptive body part (and various other) fields for nymphs, duns, and spinners. And perhaps best of all, it allows single click display of all fields contained in the database for that particular species (or subspecies). Enjoy. ;)
  16. Taxon Moderator

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    Hi Gary,

    Just this evening, I received back (what I consider to be) adequate confirmation of genus Ecdyonurus. As to the genus common name, in keeping with Schwiebert, let's simply go with Western Cahill.

    IDENTIFICATIONS

    Order common name: Mayfly (Gary Knowels)
    Order taxonomic name: Ephemeroptera (Gary Knowels)
    Family common name: Flatheaded Mayflies (Travis Bille)
    Family taxonomic name: Heptageniidae (Gary Knowels)
    Genus common name: Western Cahill (Gary Knowels)
    Genus taxonomic name: Ecdyonurus (Gary Knowels)
    Lifestage: Nymph (Gary Knowels)