Nymph ID

P.Dieter

Just Another Bubba
#1
Anyone care to help with ID on some nymphs from KingCo rivers?

1



2


3


4


I think I got a couple of them but binomial nomenclature really aint my bag
 

cabezon

Sculpin Enterprises
#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.

Steve
 
#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
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.

Steve
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.

Thanks
 

cabezon

Sculpin Enterprises
#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.

Steve
 

Taxon

Moderator
Staff member
#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.
 

cabezon

Sculpin Enterprises
#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.]

Steve
 

P.Dieter

Just Another Bubba
#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
 

Taxon

Moderator
Staff member
#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.