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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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Dorsal view of a Gomphidae Dragonfly Nymph from the Namekagon River in Wisconsin
Davisbugg
Posts: 1
Davisbugg on Mar 24, 2007March 24th, 2007, 11:03 am EDT
my daughter and i found one of these in the river. she is very cerious can you tellme what they eat or if it will turn into some other bugplease tell me wat we need to do.
thanks,

davisbugg
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Mar 25, 2007March 25th, 2007, 4:11 am EDT
The entomologists here will know more about what it eats, but I believe dragonfly nymphs are carnivorous, and eat other water creatures. To see what it will turn into, use the Google search function at http://www.google.com and search dragonfly insect. I believe you will get pictures of the adult.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Mar 26, 2007March 26th, 2007, 8:02 am EDT
Thanks, David. I did the "clubtail" search and learned a bit more about these bugs.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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