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

Where & when

In 2 records from GBIF, adults of this species have been collected during October (50%) and November (50%).

In 1 record from GBIF, this species has been collected at elevation of 3500 ft.

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: 9-10 mm
Wing length: 10 mm

Very similar to the Cinygmula gartrelli in genitalic characters. Differs at once by the uniform light amber coloration of the entire wings and the lack of heavy cross-veining. Male. Head smoky brown with the pits of the antennae pale ochreous; thorax brown, a slightly paler shade than in gartrelli, with more extended lighter brown shading cephalad of the scutellum; pleural coloration much as in gartrelli. Abdomen dorsally with the hyaline areas on segments II-VII more extended, in consequence the brown posterior banding is narrower and also paler, showing none of the ruddy shades of gartrelli; the opaque posterior segments are almost unicolorous sepia-brown with a fine, blackish, posterior border to VIII. Ventrally very pale ochreous, segments VIII and IX shaded with light ochre-brown; ganglionic marks very faint, slightly ruddy. Forceps and setae light smoky. Legs light brown, the anterior tibia considerably longer than trochanter and femur combined and longer than the same joint in gartrelli; mid and hind femora lightly tinged with ruddy. Wings unicolorous light amber with fine brown veins and crossveins.

Female Spinner

Body length: 9-10 mm
Wing length: 10 mm

Very similar to male. Head brown, frequently with considerable ruddy suffusion, vertex tipped laterally with light ochreous.

Specimens of the Mayfly Species Cinygmula uniformis

1 Male Spinner

Start a Discussion of Cinygmula uniformis


Mayfly Species Cinygmula uniformis

Species Range
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