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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 Nixe lucidipennis

Where & when

The only fly fishing book in which I've found a mention of this species is Mayflies, the Angler, and the Trout. Arbona says there are "fair hatches" of in northern Wisconsin and Michigan, although it has not turned up in my samples.

In 13 records from GBIF, adults of this species have been collected during July (85%), June (8%), and August (8%).

In 2 records from GBIF, this species has been collected at elevations of 3 and 26 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 Heptagenia lucidipennis
Body length: 6 mm
Wing length: 7 mm

Mesonotum dark brown; abdominal tergites largely brown; genitalia of the lucidipennis type.

Frontal portion of head very slightly shaded with brown; vertex dark brown or reddish. Thoracic notum dark brown; pleura and sternum light yellowish. Femora of fore leg dark, those of the middle and hind legs yellowish. Basal joint of fore tarsus about 1/4 the length of the second; in the hind leg, the basal tarsal joint is distinctly longer than the second joint, all joints of this tarsus being relatively long for the size of the species. Wings hyaline; longitudinal veins slightly dusky, especially the costa and subcosta; cross veins wholly colorless. Abdominal tergites blackish brown, by the original description; Dr. McDunnough states that this species has paler coloration than H. rusticalis (now a synonym of Nixe rusticalis), and with less distinct markings. Sternites pale. Forceps base and penes yellow; forceps tinged with black. Tails pale, the basal portion tinged slightly with black. Penes with a prominent inner apical projection or lobe; on the ventral surface of each division of penes is a rather prominent spine (see fig. 97). In H. rusticalis, the inner apical lobe is not so well developed, and the spines on the ventral surface are usually lacking.

Start a Discussion of Nixe lucidipennis


Mayfly Species Nixe lucidipennis

Species Range
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