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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

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.

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
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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Caddisfly Family Philopotamidae

Emergence and egg-laying behaviors vary widely within this family of net-spinning caddisflies. Some species, like Dolophilodes distinctus, have very unusual quirks. That species and Chimarra aterrima are two of the most important in this family.

Where & when

In 833 records from GBIF, adults of this family have mostly been collected during June (25%), July (19%), May (18%), August (13%), September (8%), and April (6%).

In 260 records from GBIF, this family has been collected at elevations ranging from 26 to 10322 ft, with an average (median) of 2280 ft.

Family Range

Larva & pupa biology

Shelter type: Very fine-meshed nets

Specimens of the Caddisfly Family Philopotamidae

1 Adult
1 Male Adult
1 Female Adult
5 Larvae

Discussions of Philopotamidae

Emerger pictures anyone???
5 replies
Posted by Hellgie on Mar 30, 2010 in the genus Chimarra
Last reply on Apr 9, 2018 by Gazzer
I would like to see a picture of an emerging Chimarra or a pupa stage before emerging if anyone has one. I am baffled and curious to how and when they change from a yellow/orange larva to a black adult fly. Also, what would be a good emerger pattern for this fly? Lafontaine emerger in what color?
6 replies
Posted by Btopbuckeye on Mar 4, 2015 in the genus Chimarra
Last reply on Mar 6, 2015 by Crepuscular
I had a large swarm of black sedges in a size 16 ovipositing today.the females hadvblack wings and body with a green egg sack was just wondering if that is this genus or something totally different
Pupa color?
6 replies
Posted by Frankcoz on Mar 27, 2008 in the genus Chimarra
Last reply on Apr 5, 2012 by Entoman
Seems like dead drifting the pupa pattern during the emergence time is a good way to fish this before the adults are on the water.

Does the pupa retain the orange color of the larva or do they have the color of the adult?
bright green?
1 replies
Posted by Phishheaduj on Jan 12, 2009 in the genus Chimarra
Last reply on Jan 12, 2009 by Taxon
i recently came across with a bright green one of these. Is that the same or a completely different species?

Start a Discussion of Philopotamidae


  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.

Caddisfly Family Philopotamidae

Genus in Philopotamidae: Chimarra, Dolophilodes, Wormaldia
2 genera (Fumonta and Sisko) aren't included.
Family Range
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