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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Red_green_h on Jul 10, 2020July 10th, 2020, 2:27 pm EDT
Looks like a beauty. I could probably hook every branch across it.
Wbranch on Jul 11, 2020July 11th, 2020, 1:54 am EDT
Looks like an awesome tight line nymphing run.
Catskill fly fisher for fifty-five years.
Partsman on Jul 11, 2020July 11th, 2020, 8:41 am EDT
My pictures really are not good, the cell phone just does not do justice. But if you look just up stream from the black water there are some really nice riffles, small caddis I believe anyways were hatching in the riffles and then floating into that black colored water. There were fish rising, and I fished a rather large size 14 caddis and caught close to 15 fish. One was a really nice rainbow, which rainbows are not unusual here, there mostly steelhead parr. I didn't want to do the fish picture thing because I didn't bring a net, the warm temps had me releasing fish as quick as possible with as little handling as possible. Anyway, I hope everyone here is doing good, I have had possibly the best year of fishing and yet I feel as though something is missing with all of the madness going around. Cooler temps next, I may hit the Ausable again, early morning tricos and then some terraistals later in the morning.
Take care and have some fun, Mike.
Take care and have some fun, Mike.
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