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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 Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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 Odontoceridae

See Psilotreta for details about the most important genus. It is an important genus with several important quirks.

The other genera are not abundant in trout streams.

Where & when

In 95 records from GBIF, adults of this family have mostly been collected during June (49%), May (24%), and July (13%).

In 75 records from GBIF, this family has been collected at elevations ranging from 20 to 8301 ft, with an average (median) of 2621 ft.

Family Range

Specimens of the Caddisfly Family Odontoceridae

1 Male Adult
1 Larva

Start a Discussion of Odontoceridae

References

Caddisfly Family Odontoceridae

Taxonomy
Genus in Odontoceridae
PsilotretaDark Blue Sedges
2
20
Genus in Odontoceridae: Psilotreta
5 genera (Marilia, Namamyia, Nerophilus, Parthina, and Pseudogoera) aren't included.
Family Range
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