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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
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.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
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.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Female Tricorythodes (Trico) Mayfly Spinner Pictures

This Trico was alive in the photos but didn't pose well.

Lateral view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York
Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York
Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York
Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York
Dorsal view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York
Ventral view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York
Ruler view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Neversink River in New York The smallest ruler marks are 1 mm.

This mayfly was collected from the Neversink River in New York on September 8th, 2006 and added to Troutnut.com by Troutnut on October 4th, 2006.


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Female Tricorythodes (Trico) Mayfly Spinner Pictures

Collection details
Location: Neversink River, New York
Date: September 8th, 2006
Added to site: October 4th, 2006
Author: Troutnut
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