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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Jsff75 on Dec 17, 2015December 17th, 2015, 9:35 am EST
Let's discuss, what do you do when your going to fly fish new rivers?
Entoman on Dec 18, 2015December 18th, 2015, 6:10 pm EST
Normally it is the policy of this forum to delete blatant advertising, but your approach is intriguing... Assuming sincerity in your interest to join our forum, only your link has been deleted. Discussion on the interesting question you raised Is certainly encouraged.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Planettrout on Dec 19, 2015December 19th, 2015, 5:23 am EST
What did your Grandmother teach you Joe ?
When I got serious about this, on the Roaring Fork, forty years ago, Chuck and Georges made a point of instructing me to find out exactly what is in the biomass at any given time, imitate it and proceed from there.
Teh Google makes that a lot easier these days... :0)
PT/TB
When I got serious about this, on the Roaring Fork, forty years ago, Chuck and Georges made a point of instructing me to find out exactly what is in the biomass at any given time, imitate it and proceed from there.
Teh Google makes that a lot easier these days... :0)
PT/TB
Daughter to Father: "How many arms do you have, how many fly rods do you need?"
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