Aquatic Insect #11 ID?

Discussion in 'Fly Fishing Entomology' started by Taxon, Aug 12, 2012.

  1. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    [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
    Sex
  2. jwg Active Member

    Posts: 558
    Ratings: +118 / 0
    Order Ephemeroptera - Mayflies
    Family Ameletidae - Combmouthed Minnow Mayflies
    Genus Ameletus
    Brown Dun
    Lifestage Imago
    Sex: Male


    Jay
  3. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    Hi Jay-

    The family is not Ameletidae. Hint: look more closely at the tails.

    IDENTIFICATIONS

    Order common name: Mayfly (jwg)
    Order taxonomic name: Ephemeroptera (jwg)
    Family common name: ???
    Family taxonomic name: ???
    Genus common name: ???
    Genus taxonomic name: ???
    Lifestage: imago (jwg)
    Sex: male (jwg)
  4. jwg Active Member

    Posts: 558
    Ratings: +118 / 0
    Family Siphlonuridae - Primitive Minnow Mayflies

    Genus Siphlonurus

    Gray drake

    Jay
  5. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    Hi Jay-

    I'm afraid you are on the wrong track. What did you make of the hint which I provided?
  6. jwg Active Member

    Posts: 558
    Ratings: +118 / 0
    Not sure

    Are there really three tails,only one is tiny?

    Jay
  7. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    Hi Jay-

    Compare the relative diameter of the two obvious tails. What does that tell you?
  8. Travis Bille Active Member

    Posts: 666
    Ratings: +370 / 0
  9. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    Hi Travis-

    You are absolutely correct; it is a spinner. With mayflies, which have two winged lifestages: subimago = dun; imago = spinner. Dun and spinner are flyfishing terms for lifestage. Subimago and imago are entomology terms for lifestage. However, jwg has already correctly identified the lifestage as imago, so he retains credit for lifestage identification.
  10. jwg Active Member

    Posts: 558
    Ratings: +118 / 0
    I see how one tail is thicker than the other but don't know what to do with that clue

    Jay
  11. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    HI Jay-

    What looks (at first glance) to be the right tail is being held in an unnatural position by a strand of the spider web, which is probably also responsible for the actual right tail having broken off at its base as the mayfly struggled to free himself.

    So, one needs to ask, what mayfly genera are characterized by (3) tails in their winged lifestages, and with their middle tail being shorter and smaller in diameter than the outer two?
  12. jwg Active Member

    Posts: 558
    Ratings: +118 / 0
    That narrows things down considerably, and leads to quite a different possible list than assuming two tails only.

    How about this:

    Family: Leptophlebiidae

    Pronggilled Mayflies

    Genus: Leptophlebia

    Black Quill


    Jay
  13. Taxon Moderator

    Posts: 953
    Ratings: +112 / 0
    Good job, Jay.

    IDENTIFICATIONS

    Order common name: Mayfly (jwg)
    Order taxonomic name: Ephemeroptera (jwg)
    Family common name: Pronggilled Mayfly (jwg)
    Family taxonomic name: Leptophlebiidae (jwg)
    Genus common name: Black Quil (jwg)
    Genus taxonomic name: Leptophlebia (jwg)
    Lifestage: imago (jwg)
    Sex: male (jwg)