The important western genus Hesperoperla currently has only two species. See the species hatch pages for details.
» Genus Hesperoperla (Golden Stones)
1 species isn't included.
Pictures of 8 Stonefly Specimens in the Genus Hesperoperla:
Hesperoperla pacifica (Golden Stone) Stonefly Nymph
View 1 PicturesThis monster started to feed within a few minutes of sharing the inspection tray with its victims. This nymph is a voracious predator of small invertebrates and has even been noted for feeding on small fish and salmonid alevins. The niche it fills in fast water is equivalent to the Dragonfly nymphs that inhabit slower water.
Hesperoperla pacifica nymphs are easily distinguished from other western perlids by the presence of anal gills (obfuscated by algae in the tray) in combination with an hour glass shaped pale mark on the front of their heads.
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