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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for 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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Mayfly Species Arthroplea bipunctata

Where & when

In 11 records from GBIF, adults of this species have been collected during June (45%), July (27%), and May (27%).

Species Range

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Male Spinner

Body length: 6 mm
Wing length: 8 mm

Head deep dark brown; clypeus hyaline. Thorax deep dark brown. Fore femur deep brown; tibia pale brown; tarsus dirty whitish. Basal fore tarsal joint about 2/3 the length of the second. Middle and hind legs dull yellowish; median and apical dark spots on femora; tarsal joinings and claws dark brown. Wings hyaline; a faint brownish stain at extreme base, much as in Choroterpes basalis. Longitudinal veins pale brown; cross veins colorless, indistinct except in the apical costal area. Abdominal tergites deep blackish brown; sternites somewhat paler, posterior margins narrowly dull whitish, “this color on the rear segments extending to the lateral portions of the dorsum” (McD.). Tails whitish, joinings narrowly dark brown. Genitalia as in fig. 112.


Start a Discussion of Arthroplea bipunctata

References

  • Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.

Mayfly Species Arthroplea bipunctata

Taxonomy
Species Range
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