Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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Updates from May 30, 2011
Closeup insects by Bnewell from the Touchet River in Washington
An adult stonefly carrying a load of red mites.
Scenic spring hike up Gunnysack Creek in the Alaska Range
By Troutnut on May 22nd, 2011
I had always wondered about the little mountain streams feeding into the Delta River along the Richardson Highway on the north side of the Alaska Range, but this is the first time I explored one of them. The topo maps show that they wind back into steep-walled canyons a short distance upstream from the road, and the scenery there did not disappoint.
It was a great trip until my dog found a porcupine!
It was a great trip until my dog found a porcupine!
Photos by Troutnut from Gunnysack Creek, the Delta River, and Bear Creek in Alaska
No burbot, but a nice sunset
By Troutnut on May 18th, 2011
I went burbot fishing last night, checking out a spot I had unsuccessfully fished with my setlines. The problem with those was that my lines got caught on the rock riprap at the end of the dike, so I thought with rod & reel I might have a chance to get out past the rocks. Unfortunately, the current of the eddy kept pulling the bait back into the rocks, so I went through about $5 in tackle and bait before I even found a position where my bait would hold still and I could actually fish.
Then I didn't catch anything.
Oh, well... it was a great sunset!
Then I didn't catch anything.
Oh, well... it was a great sunset!
Photos by Troutnut from the Tanana River in Alaska
References
- Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.