Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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Stonefly Genus Acroneuria (Golden Stones)
This abundant genus has three important East/Midwest species. The superabundant species in the West have been moved to the new genera Calineuria and Hesperoperla.
Genus Range
Identification
To determine whether a specimen of Perlidae belongs to Acroneuria, use the Key to Genera of Perlidae Nymphs.
Specimens of the Stonefly Genus Acroneuria
1 Female Adult
6 Nymphs
The presence of anal gills, large dark spot in the center of the pale occipital bar point to lycorias.
Start a Discussion of Acroneuria
References
- Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.
Stonefly Genus Acroneuria (Golden Stones)
Taxonomy
Species in Acroneuria
Acroneuria abnormisCommon Stone
3
32
Acroneuria arenosaEastern Stone
0
0
Acroneuria carolinensisCarolina Stoneflies
1
3
Acroneuria kosztarabiVirginia Stone
0
0
Acroneuria lycoriasBoreal Stoneflies
3
29
Species in Acroneuria: Acroneuria abnormis, Acroneuria arenosa, Acroneuria carolinensis, Acroneuria kosztarabi, Acroneuria lycorias
10 species (Acroneuria arida, Acroneuria evoluta, Acroneuria filicis, Acroneuria flinti, Acroneuria frisoni, Acroneuria hitchcocki, Acroneuria internata, Acroneuria ozarkensis, Acroneuria perplexa, and Acroneuria petersi) aren't included.