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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JeffRome
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Posts: 1
JeffRome on Apr 20, 2012April 20th, 2012, 6:44 pm EDT
I am considering a trip to Patagonia next spring. I have a choice of the Limay Medio River or the San Martin de los Andes area. With the Limay, I am sort of concerned about the type of fishing....I read in Fly-Fishing in Patagonia, A Trout Bum's Guide to Argentina that the migratory browns only feed about 3 hours per day and it is pretty hard fishing--windy with lots of sinking line fishing. And that it is a river for trophy fishing, not consistent action. While I'm sort of worried that the San Martin area rivers such as the Malleo and the Chimehuin are "crowded" these days. I don't want to go all the way down there and have other fisherman around like I was in Henry's Fork or Yellowstone. And that the "fishing is not what it was" but instead resting on reputation. Does anyone have any recent experience with these areas and some advice? The San Martin trip is in mid February and the Limay trip is in mid March. Thanks!!!
Jesse on Apr 21, 2012April 21st, 2012, 8:08 pm EDT
I can't give you advice for those particular trip options, but i can say that we BETTER see some shaweeeet pictures when you get back!
Most of us fish our whole lives..not knowing its not the fish that we are after.
http://www.filingoflyfishing.com
http://www.filingoflyfishing.com
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