Nymph ID

Discussion in 'Fly Fishing Entomology' started by P.Dieter, Feb 25, 2011.

  1. Anyone care to help with ID on some nymphs from KingCo rivers?





    I think I got a couple of them but binomial nomenclature really aint my bag
  2. I don't know.....but that last one looks like my wife when she's @#!*% 'd at me!

    By the way, great pics!
  3. smells of a stonefly of some variety...possibly golden but depends on time of year
  4. P,
    What exactly are you asking? Want to know what family/genus ?
  5. sure would

    pretty sure the last one is Epeorus punctatus
  6. piture two looks to me like a yellow sally. perlodidae isoperla if i remember correctly
  7. One of the best resources that I use for identifying stream insects is "Guide to Pacific Northwest Aquatic Invertebrates" by Rick Hafele and Steve Hinton. It is available from Oregon Trout and is pretty cheap.

    Here are my shots at identifying these bugs.
    Picture one. The top bug looks like a slate-winged olive (Drunella sp.) from page 12 of the guide. The caddis on the bottom is harder to identify. The best I can do in Limnephilidae (pg. 20), but I don't have much confidence in that ID.
    Picture 2. This is a little yellow stone, Isoperla sp. (pg. 14). It has light and dark stripes, no obvious external gills, and tails as long or longer than the abdomen
    Picture 3. This is another slate-winged olive (Drunella sp., pg. 12). See the enlarged femurs on the first pair of legs and the light/dark banding on the three tails.
    Picture 4. This is a small yellow may (Epeorus sp., pg. 10). Flattened body with only two tails and a wide head.
    All of these species are extremely intolerant of pollution. Like canaries in a coal mine, their presence is a strong indicator of very good water quality.

  8. Paul.

    Look at one of Taxon's posts.

    "WA Lakes Biotic Survey" is a good example where he's posted some links that could help you id what you have here.
  9. Steve, can you post a link to Oregon Trout's website and/or to the guide on their website? I was unsuccessful in my google attempts.

  10. Hi Bruce,

    I bought my copy almost a decade ago. I had to dig around, but I did find a site that carries it. Oregon Trout is now the Freshwater Trust. Their online store has copies of the guide (see http://www.thefreshwatertrust.org/contribute/store) for $16.95. I have also used the field guide from the Xerces Society (see http://www.xerces.org/wetland-invertebrate-identification-guide/). What we need is a bright guy like Taxon (hint, hint) to develop a downloadable app with a dichotonomous key and his great pictures that folks can use in the field.

  11. Paul,

    Photo #1 - Agree with Steve that the mayfly nymph is Drunella. As to the cased caddis larva, I really can't see it well enough to offer an opinion.

    Photo #2 - Agree with Bitter Rocklark and Steve, that it is Isoperla.

    Photo #3 - Agree with Steve that is is Drunella. More specifically, it's a stunningly gorgeous photo of a Drunella spinifera nymph, based on the relative length of the last two pairs of abdominal tubercles.

    Photo #4 - Agree with you and Steve that this is Epeorus. However, it would not be E. punctatus, as its distribution is limited to the Atlantic Northeast.
  12. Yeah, Roger has spoken!! What did I win, Paul? [Very nice photos, by the way. I am serious about the idea of an online ID app. Combine the great photos on Roger's site with some of the more comprehensive fly galleries. Imagine an app where you can click on the picture of a mayfly that you just observed emerge and a list of potential patterns would appear.]

  13. Thanks guys
    1 and 3 are the same bug, different shots (should have pointed that out upfront)
    I had the yellow sally but the striping is more defined then the pictures I had.
    I called punctaus on #4 because although the distribution is different (all I have is Schwiebert's Nymphs) the markings on the wingcase are dead-on the illustration and none of the others are even close.

    First three from the Cedar, last one from S.F. Snoqualmie
  14. Paul-

    As pretty as color photos of aquatic insects can be, I often find it useful to convert them to greyscale in order to keep from being distracted by color when making comparisons. Here is your photo on the left, and another photo from Oregon tentatively identified as Drunella grandis, both converted to greyscale.

  15. The first two I believe are damsel fly nymphs. The last one looks like a dragon fly nymph.
  16. Keith-

    Rx: Study this. [​IMG]
  17. the grey scale conversion is a good idea Taxon. Nothing Grandis about my specimen though, quite small, but those markings sure match and I guess the two tails make it Epeorus.

    Genius is all I really need anyway.
  18. Keith you are funny! Keep drinking.
  19. Thank you very much Steve.

  20. Not a damsle fly nymph. To short in the body... Mayfly nymph..

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