Aquatic Insect #13

Discussion in 'Fly Fishing Entomology' started by Taxon, Sep 20, 2012.

  1. Taxon

    Taxon Moderator Staff Member

    [​IMG]This aquatic insect was captured late yesterday afternoon. It was pretty much expired, but floating on the water's surface, perhaps 15 feet from shore, alongside a fishing pier on Lake Washington. It was 8 mm as measured from the front of its head to the end of its wings. Can you identify it by any of the following:

    Order common name:
    Order taxonomic name:
    Family common name:
    Family taxonomic name:
    Genus common name:
    Lifestage:
     
  2. zen leecher aka bill w

    zen leecher aka bill w born to work, forced to fish

    It's a caddis for starters.
     
  3. Taxon

    Taxon Moderator Staff Member

    Hi zen leecher aka bill w-
    Yes, that it is.

    IDENTIFICATIONS

    Order common name: Caddisfly (zen leecher aka bill w)
    Order taxonomic name: ???
    Family common name: ???
    Family taxonomic name: ???
    Genus common name: ???
    Lifestage: ???
     
  4. zen leecher aka bill w

    zen leecher aka bill w born to work, forced to fish

    pupa. And that's about it for me.
     
  5. Taxon

    Taxon Moderator Staff Member

    It is not a pupa.
     
  6. McNasty

    McNasty Canyon Lurker

    has to be an adult
     
  7. Taxon

    Taxon Moderator Staff Member

    McNasty-
    Yes, it's an adult.

    Order common name: Caddisfly (zen leecher aka bill w)
    Order taxonomic name: ???
    Family common name: ???
    Family taxonomic name: ???
    Genus common name: ???
    Lifestage: Adult (McNasty)
     
  8. plecoptera419

    plecoptera419 Member

    Order: Tricoptera

    As to the rest, is it possible we can get a clearer photo? How long are the antenna as compared to the wings? I have a couple of good guesses, but I cant quite make out how many spurs I am seeing on the front and middle tibia.
     
  9. Taxon

    Taxon Moderator Staff Member

    Hi plecoptera419-

    I will take and post a photo if the fore and middle legs when I have time later today. As to the antennae, they were accidentally broken off a bit beyond where I cropped the photo, probably in the process of collecting. However, the would have been at least 2 1/2 times the length of the wings.
     
  10. plecoptera419

    plecoptera419 Member

    I like this game. Post pics. Please. I can guess and be wrong or...
     
  11. Taxon

    Taxon Moderator Staff Member

    Hi plecoptera419-

    [​IMG]

    [​IMG]

    Well, it turns out that dissecting something so small under my stereo microscope without proper tools is a bit more difficult than anticipated. In any event, these are photos of what I believe to be a fore leg, and what I believe to be either a middle leg or a hind leg.
     
  12. plecoptera419

    plecoptera419 Member

     
  13. Taxon

    Taxon Moderator Staff Member

    Hi plecoptera419-

    Good job. Leptoceridae is correct. The next step should somewhat easier.
    Hint: focus on the forewing marking.

    Order common name: Caddisfly (zen leecher aka bill w)
    Order taxonomic name: ???
    Family common name: ???
    Family taxonomic name: Leptoceridae (plecoptera419)
    Genus common name: ???
    Genus taxonomic name: ???
    Lifestage: Adult (McNasty)
     
  14. plecoptera419

    plecoptera419 Member

    Ok so based on the forewing marking and further research,

    Genus common name: ??? Long Horned Sedges
    Genus taxonomic name: ??? Oecetis

    I am also thinking this is most likely Oecitis Avara
     
  15. Taxon

    Taxon Moderator Staff Member

    Excellent work, plecoptera419. I also believe the genus to be Oecetis, and although I also concluded that O. ariva was likely, identifying caddisflies to species from a photo is tends to be speculative at best.

    IDENTIFICATIONS

    Order common name: Caddisfly (zen leecher aka bill w)
    Order taxonomic name: Trichoptera (Taxon)
    Family common name: Longhorned Casemaker (Taxon)
    Family taxonomic name: Leptoceridae (plecoptera419)
    Genus common name: Longhorned Sedge (plecoptera419)
    Genus taxonomic name: Oecetis (plecoptera419)
    Species: (likely) avara (plecoptera419)
    Lifestage: Adult (McNasty)
    Sex: Female (Taxon)
     
  16. Taxon

    Taxon Moderator Staff Member

    Incidentally, for anyone reading this thread, who would like to see how a live Oecetis looks, this one was photographed by by Kevin Hall near Lacey, WA, on July 9, 2010:[​IMG]
     
  17. zen leecher aka bill w

    zen leecher aka bill w born to work, forced to fish

    The wings and body looked too soft to be an adult (to me). It looked along the line of the lime green pupa emergers I'd see up in BC.
     
  18. Taxon

    Taxon Moderator Staff Member

    It was definitely an adult. A caddisfly pupa looks like this before shedding its pupal exoskeleton:

    [​IMG]
     
  19. zen leecher aka bill w

    zen leecher aka bill w born to work, forced to fish

    Roger, you know way more about taxonomy than me. I'm just relating it to what little I've seen.
     
  20. Taxon

    Taxon Moderator Staff Member

    I understand; no problem on this end. ;)
     

Share This Page