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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.

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 Leptophlebia bradleyi (Black Quills)

Where & when

In 1 records from GBIF, adults of this species have been collected during March (100%).

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 Paraleptophlebia bradleyi
Body length: 8 mm
Wing length: 9 mm

A dark brown species with yellowish wings; the femora black-ringed.

Head and thorax brown. Legs yellowish brown, with black rings on the apical third of all the femora. Wings hyaline, tinged with yellow. Veins brown. Costal cross veins numerous and distinct; stigmatic cross veins crowded and irregular, and anastomosed to form two rows of cells in the costal space, the outermost row being half the width of the inner one. Entire stigmatic area, and the radial space below it, semi-opaque, greyish.

Abdomen brown, darker at the ends. Tergites 1-8 with a narrow pale mid-dorsal line. On each side of this line are two rows of pale triangular spots, confluent on the basal margin. Ventrally paler, somewhat yellowish; ganglia not marked. Genitalia pale brown. Basal joint of the forceps slowly tapering and sinuately curved; the two small terminal segments dilated internally and subtriangular. Three short terminal joints are present, on one specimen. Penes long, tapering, separated by a V-shaped cleft for three-fourths of their length. Reflexed spur curved, spatulate, acute at the tip, reaching to the level of the bottom of the cleft (see fig. 134).

Start a Discussion of Leptophlebia bradleyi


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

Mayfly Species Leptophlebia bradleyi (Black Quills)

Species Range
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