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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 Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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 Species Mystacides sepulchralis (Black Dancers)

Where & when

Preferred waters: Spring ponds and rivers

In 111 records from GBIF, adults of this species have mostly been collected during June (27%), August (25%), July (24%), May (14%), and September (7%).

In 35 records from GBIF, this species has been collected at elevations ranging from 3 to 3873 ft, with an average (median) of 1181 ft.

Species Range

Larva & pupa biology

Current speed: Still or slow

Specimens of the Caddisfly Species Mystacides sepulchralis

2 Adults
1 Male Adult

Start a Discussion of Mystacides sepulchralis

References

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

Caddisfly Species Mystacides sepulchralis (Black Dancers)

Taxonomy
Species Range
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