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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.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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 Anafroptilum conturbatum (Tiny Sulphur Duns)

Where & when

Time of year : June to October

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

In 2 records from GBIF, this species has been collected at elevations of 1450 and 6542 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

Described in Needham et al (1935) as Centroptilum conturbatum
Body length: 5 mm
Wing length: 5 mm

Abdominal tergites 2-6 of male imago hyaline white; inner margin of second forceps joint distinctly tuberculate; distal joint unusually long.

Turbinate eyes dark blackish brown, in dried specimen. Head and thorax shiny black; pleural sutures brownish. Legs white. Wings hyaline, venation pale (see fig. 165). Abdominal segments 2-6, and part of 7, hyaline white, sometimes with faint dusky shading posteriorly on the middle tergites. Tergites 8-10, and often part of 7, chocolate brown. Sternites white; 2-6 hyaline, 7-9 opaque. Tails white. Second joint of forceps distinctly tuberculate on its inner margin; third joint strongly bowed; distal joint unusually long (see fig. 168). The plate between the bases of the forceps is conical on its posterior margin.

Specimens of the Mayfly Species Anafroptilum conturbatum

1 Nymph

Start a Discussion of Anafroptilum conturbatum


Mayfly Species Anafroptilum conturbatum (Tiny Sulphur Duns)

Species Range
Common Name
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