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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Wiflyfisher on Jun 29, 2020June 29th, 2020, 10:47 pm EDT
My question is about Ephemerella dorothea dorothea body color.
Om May 30th I was capturing in my seine yellow body E. dorothea.
The fishing was great by the way. :-)
Then in the same section of the river on June 10th, I was again capturing what to me is the same specie but the body color is definitely an olive color.
So has anyone noticed in the same section of river E. dorothea varying that much in body color, or as the hatch progresses the body colors vary?
Om May 30th I was capturing in my seine yellow body E. dorothea.
The fishing was great by the way. :-)
Then in the same section of the river on June 10th, I was again capturing what to me is the same specie but the body color is definitely an olive color.
So has anyone noticed in the same section of river E. dorothea varying that much in body color, or as the hatch progresses the body colors vary?
John S.
https://WiFlyFisher.com
https://WiFlyFisher.com
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Re: So is Ep Infrequens now known as Ep Dorothea?
In the Mayfly Species Ephemerella dorothea infrequens by Wbranch
In the Mayfly Species Ephemerella dorothea infrequens by Wbranch
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Jul 1, 2014
by Crepuscular
by Crepuscular
