Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

11 Recently Added Photos

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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Stonefly Genus Zapada (Tiny Winter Blacks)

Where & when

In 118 records from GBIF, adults of this genus have mostly been collected during April (32%), March (19%), May (11%), February (10%), June (10%), July (8%), and January (5%).

In 80 records from GBIF, this genus has been collected at elevations ranging from 34 to 11135 ft, with an average (median) of 6755 ft.

Genus Range

source

Map of specific collection sites

Specimens of the Stonefly Genus Zapada

2 Female Adults

Female Zapada columbiana (Tiny Winter Black) Stonefly Adult

2 Pictures

Female Zapada columbiana (Nemouridae) (Tiny Winter Black) Stonefly Adult from the N. Fk Touchet River in Washington

Collected March 25, 2012 from the N. Fk Touchet River in Washington

Added by Bnewell on March 26, 2012

Collected March 25, 2012 from the N. Fk Touchet River in Washington and added by Bnewell on March 26, 2012

Female Zapada cinctipes (Tiny Winter Black) Stonefly Adult

1 Picture

Female Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Adult from the Touchet River in Washington

From N. Touchet River at Touchet Corral.

Collected June 24, 2011 from the Touchet River in Washington

Added by Bnewell on June 26, 2011

Collected June 24, 2011 from the Touchet River in Washington and added by Bnewell on June 26, 2011

1 Adult

Zapada cinctipes (Tiny Winter Black) Stonefly Adult

1 Picture

Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Adult from the N. Fk. Touchet River in Washington

Collected April 16, 2012 from the N. Fk. Touchet River in Washington

Added by Bnewell on April 21, 2012

Collected April 16, 2012 from the N. Fk. Touchet River in Washington and added by Bnewell on April 21, 2012

1 Nymph

Zapada cinctipes (Tiny Winter Black) Stonefly Nymph

13 Pictures

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.

Collected February 17, 2023 from the Yakima River in Washington

Added by Troutnut on February 20, 2023

Collected February 17, 2023 from the Yakima River in Washington and added by Troutnut on February 20, 2023