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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.

Caddisfly Genus Helicopsyche (Speckled Peters)

See Helicopsyche borealis for details. It is the only important trout stream species in this genus.

Specimens of the Caddisfly Genus Helicopsyche

1 Adult
Helicopsyche borealis (Speckled Peter) Caddisfly Adult
This one keys pretty easily to the Helicopsychidae family, of which there is only one genus in North America, and one species reported in this general area.
1 Pupa
Helicopsyche borealis (Speckled Peter) Caddisfly Pupa
I'm calling this one very tentatively Helicopsyche borealis, with some big caveats that I might be wrong.

It seems to key fairly easily to Helicopsychidae, except at the last couplet in Merritt & Cummins (5th ed) it's supposed to have “anal processes short and straight, each with several mesal setae and 2 long apical setae,” whereas this one has VERY short, straight processes with 3 long apical setae and no mesal ones.

Additionally, the only species of Helicopsychidae documented in this region is Helicopsyche borealis, which is supposed to emerge much later in the summer.

1 Underwater Picture of Helicopsyche Caddisflies:

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  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
» Genus Helicopsyche (Speckled Peters)
Species in Helicopsyche
Helicopsyche borealisSpeckled Peter220
8 species (Helicopsyche annulicornis, Helicopsyche arenifera, Helicopsyche limnella, Helicopsyche mexicana, Helicopsyche paralimnella, Helicopsyche piroa, Helicopsyche pupoidea, and Helicopsyche sinuata) aren't included.
Genus Range
Common Name
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