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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 Dolophilodes distincta (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult Pictures

This is a really strange specimen. I would guess it's one of the dry caddis pupa that scoots across the surface of the water as a pupa rather than emerging right away. Its "wing pads" sure don't look right, though. Maybe they're deformed and that's why I was able to find this one as a pupa in the first place. It also looks like it might be a caddis adult missing its wings, but since I found three of them, that kind of rules out such an anomalous maiming.

I found this one and one other on a midstream rock. The previous day, I caught a similar creature kicking around on the water's surface.

This one died and shriveled a little bit before I could photograph it, but it's basically in its original shape.

Ruler view of a Female Dolophilodes distincta (Philopotamidae) (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult from Brodhead Creek in Pennsylvania The smallest ruler marks are 1 mm.
Female Dolophilodes distincta (Philopotamidae) (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult from Brodhead Creek in Pennsylvania
Dorsal view of a Female Dolophilodes distincta (Philopotamidae) (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult from Brodhead Creek in Pennsylvania
Ventral view of a Female Dolophilodes distincta (Philopotamidae) (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult from Brodhead Creek in Pennsylvania
Female Dolophilodes distincta (Philopotamidae) (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult from Brodhead Creek in Pennsylvania
Female Dolophilodes distincta (Philopotamidae) (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult from Brodhead Creek in Pennsylvania

This caddisfly was collected from Brodhead Creek in Pennsylvania on May 29th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Adult

Dolophilodes adult
3 replies
Posted by Ictodd on Jun 7, 2007
Last reply on Nov 22, 2007 by GONZO
Ross (1944) mentions that Dolophilodes (Trentonius) distinctus adults "...remarkable b/c of the production of adults during the entire year, incl. the winter months, and the wingless condition of most of the females.....records indicate the females produced during the colder months are all wingless.....Winged females have been taken during the warmer months of the year." He goes on to mention that wing presence is caused by temperature reactions influencing late larvae. Was it a really cold stream? Seems late for ambient air influences.
Dragonfly nymph?
12 replies
Posted by Taxon on Jun 4, 2007
Last reply on Jun 13, 2007 by Litobrancha
Ignoring the (perhaps deformed) wing pads, to me at least, the general body shape looks a lot more like a dragonfly nymph.

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Female Dolophilodes distincta (Tiny Black Gold Speckled-Winged Caddis) Caddisfly Adult Pictures

Collection details
Location: Brodhead Creek, Pennsylvania
Date: May 29th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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