Trichoptera: Lepidostomatidae of Gunnison County, ColoradoLepidostoma pluviale
Plain brown sedge, Little plain brown sedge(Milne, 1936)
Updated 4 February 2026
TSN 116875
Good Links
On this website:
Lepidostoma Introduction
Other Websites:
Photos, Map, Taxon Identifier Numbers - from the Global Biodiversity Information Facility Lepidostoma pluviale at GBIF
Photos, Map, Museum specimens, DNA - Barcodinglife.org
Illustration - University of Alberta Entomology Collection Species page
Has description, habitat information, range and more.
References
Denning,DG 1948 New and little known species of Nearctic Trichoptera. Psyche 55:16-23.
Discussed as Lepidostoma veleda.
DeWalt,RE; Stewart,KW; Moulton,SR and Kennedy,JH 1994 Summer emergence of mayflies, stoneflies, and caddisflies from a Colorado mountain stream. Southwestern Naturalist 39 3, 249-256. Abstract and first page
Kumar,A; Dunkel,FV; Broughton,MJ and Sriharan,S 2000 Effect of root extracts of Mexican marigold, Tagetes minuta (Asterales: Asteraceae), on six nontarget aquatic macroinvertebrates. Environmental entomology, 29(2), pp.140-149.
Abstract: "Water-soluble root extracts of the Mexican marigold, Tagetes minuta L., composed mainly of the compounds alpha-gurjunene, 5-(But-3-ene-1-inyl)-2,2′-bithiophene, palmitic acid, alpha-terthienyl, and 5-(4-Acetoxy-1-butenyl)-2,2′-bithiophene, were assessed to determine their impact on six species of nontarget aquatic invertebrates. Test organisms were collected from a polluted stream-Gammarus lacustris Sars (Amphipoda)-as well as from a local nearly pristine stream-Lepidostoma pluviale (Milne) (Trichoptera), Drunella grandis (McDunnough) (Ephemeroptera), Baetis tricaudatis (Dodds) (Ephemeroptera), Rhithrogena morrisoni (Banks) (Ephemeroptera) and Hydropsyche cockerelli (Banks) (Trichoptera). Root extract of T. minuta, formulated with a commercial combination of petroleum solvents and surfactants, caused mortality to some of the organisms tested. Some mortality was attributable to presence of the inert, surfactant/petroleum-based solvent. For example, with L. pluviale, the LT50 for 4 ppm marigold root extract formulated with 0.01 ppm inert materials was 54.7 h (CI 48.1, 64.2), and for 0.01 ppm inert materials alone was 69.8 h (CI 55.8, 101.2). Of the macroinvertebrates tested, R. morrisoni was the most sensitive to inert materials (LT50 0.01 ppm inert = 4.5 h) and G. lacustris was the least sensitive (LT50 0.01 ppm inert = 400 h; LC50 96 h = 1.2 ppm). Marigold root extracts did have a toxic effect at the highest concentration (4 ppm) used on all macroinvertebrates tested. Although previous studies reported the effects of one compound in the root extract, alpha-terthienyl, our research is the first published report evaluating effects of full-formulation marigold root extract on immature aquatic nontarget insect species and a crustacean. If root extracts of T. minuta are to be used as a pesticide, further research should focus on effects of inert surfactants used in marigold extract formulation on nontarget macroinvertebrates."
Milne,LJ 1936 Studies in North American Trichoptera. Part 3. Cambridge, Mass. Author's publication. 128 pages.
Described as Olemira pluvialis.
Ross,HH 1946 A review of the nearctic Lepistomatidae (Trichoptera). Annals of the Entomological Society of America 39:265-291.
Discussed as Lepidostoma rhino.
Short,RA; Canton,SP and Ward,JV 1980 Detrital processing and associated macroinvertebrates in a Colorado mountain stream. Ecology, 61(4), 727-732. PDF
L. pluviale nymphs were found in all of the leaf packs, ones made of alder, willow, aspen and pine.
Weaver,JS 1988 A synopsis of the North American Lepidostomatidae (Trichoptera). Contributions of the American Entomological Institute 24, 2.
On page 81, synonmizes L. veleda with L. pluviale.
Zuellig,RE; Heinold,BD; Kondratieff,BC and Ruiter,DE 2012 Diversity and Distribution of Mayflies (Ephemeroptera), Stoneflies (Plecoptera), and Caddisflies (Trichoptera) of the South Platte River Basin, Colorado, Nebraska, and Wyoming, 1873-2010. U.S. Geological Survey Data Series 606, 257 p. PDF - caution 46MB
Quote from page 77: "This is a common Lepidostoma species in the SPRB occurring from the lower reaches of the basin to the lower mountains. It was collected from small streams and typically has a smooth, slightly curved, sand grain case." The elevation range is 5,250-9,450 feet and the adults emerge from June-September.
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