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Trichoptera: Lepidostomatidae of Gunnison County, Colorado

Lepidostoma ormeum

Ross, 1946
Updated 15 Feb 2016
TSN 568787

Good Links

On this website:
Lepidostoma Introduction

Other Websites:
University of Alberta Entomology Collection Species page
     Has illustration of male genitalia, description, habitat information, range and more.


Denning,DG 1949. New and little known species of caddis flies. American Midland Naturalist 42:112-122.
     Discussed as Lepidostoma querla.

Denning,DG 1968 New species and notes of Western Trichoptera. Journal of the Kansas Entomological Society 41:63-69.
     Discussed as Lepidostoma moneka.

Poff,NL and Ward,JV 1991 Drift responses of benthic invertebrates to experimental streamflow variation in a hydrologically stable stream. Canadian Journal of Fisheries and Aquatic Sciences, 48(10): 1926-1936.
     Abstract: Field experiments were conducted in the regulated upper Colorado River to assess drift responses of lotic macroinvertebrates to streamflow manipulations. In each of three seasons, drift was collected in one control and two experimental riffles. On the first day, no flow manipulations occurred. Six hours before sunset on the second day, streamflow was simultaneously reduced and elevated in two experimental riffles with instream diversion structures. Following flow elevation, both mean daily drift density and drift rate generally increased for 13 taxa across all seasons. Flow reductions generally induced elevated drift densities for most taxa, but drift rates declined for some taxa. Patterns of diel drift periodicity were less frequently modified by flow manipulations. Taxa with typical nocturnal peaks in drift activity (Baetis spp., Epeorus longimanus, Triznaka signata) generally maintained this pattern despite some increases in diurnal drift. For a few taxa, modification of diel drift patterns occurred, either as nocturnal decreases following reduced flow (Paraleptophlebia heteronea, Ephemerella infrequens) or as diurnal drift increases in response to either elevated flow (Lepidostoma ormeam, Chironomidae larvae) or reduced flow (Simuliidae). With some exceptions, observed drift responses could be used to suggest active versus passive processes of drift entry.

Rader RB and Ward JV. 1988 Influence of regulation on environmental conditions and the macroinvertebrate community in the upper Colorado River. Regulated Rivers: Research and Management 2:597-618. PDF
     Quote from page 611 and 612: "The reference site was represented by twelve species of caddisflies, including relatively abundant populations of Arctopsyche grandis and Rhyacophila acropedes. Trichopterans at the regulated site, however, were represented by nine rare and three slightly more abundant caddisflies (Hydroptila sp., Brachycentrus americanus, and Hesperophylax designatus). The abundance of net-spinning caddisflies was significantly reduced in the regulated site compared to both reference and recovery locations (p=0.05), as has been reported by several workers (Armitage and Capper, 1976; Müller, 1962; Ward, 1987).
The thirteen species of Trichoptera in the recovery site included four of the most abundant species of macroinvertebrates at that site: Glossosoma ventrale, Brachycentrus americanus, Lepidostoma ormeum, Oligophlebodes minutes. Ward (1987) summarized the effects of regulation on Trichoptera in Rocky Mountain streams and concluded that Rhyacophila and Hydropsyche were the only genera commonly occurring at both regulated and reference locations, whereas Brachycentrus, Glossosoma, Arctopsyche, and Lepidostoma were often reduced or absent in regulated segments. With the exception of Brachycentrus americanus, which was significantly more abundant in the regulated and recovery sites, compared to the reference site (p=0.05), data from this study concur with previous conclusions concerning the influence of reguation on Trichoptera (Ward, 1987). "

Ross,HH 1946 A review of the nearctic Lepistomatidae (Trichoptera). Annals of the Entomological Society of America 39:265-291.
     Described as L. ormea.

Weaver,JS 1988 A synopsis of the North American Lepidostomatidae (Trichoptera). Contributions of the American Entomological Institute 24, 2.

Brown,WS 2005 Trichoptera (Caddisflies) of Gunnison County, Colorado, USA