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Trichoptera: Lepidostomatidae of Gunnison County, Colorado

Lepidostoma cascadense
Little Brown Sedge

(Milne 1936)
Updated 16 Jan 2017
TSN 116886

Good Links

On this website:
Lepidostoma Introduction

Other Websites:
Photos, Map, Museum specimens, DNA - Barcodinglife.org

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


Anderson,NH and Wisseman,RW 1987 Recovery of the Trichoptera fauna near Mt. St. Helens five years after the 1980 eruption. In Proceedings of the Fifth International Symposium on Trichoptera (pp. 367-373). Springer Netherlands. PDF

DeWalt,RE; Stewart,KW; Moulton,SR; 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

Grafius,E and Anderson,NH 1980 Populations dynamics and role of two species of Lepidostoma (Trichoptera: Lepidostomatidae) in an Oregon coniferous forest stream. Ecology 61(4) 808-816. PDF
     Abstract: " The aim of this study was to gather quantitative field and laboratory data on the role of Lepidostoma cascadense (Milne) and Lepidostoma unicolor (Banks) in the processing of conifer needles in a stream ecosystem. Samples were collected monthly in a riffle-pool section of Mack Creek, Lane County, Oregon, USA. For L. cascadense, maximum larval density was 812/m2 and instantaneous growth rate was 1.5%/d. The larvae grew slowly throughout the winter and pupation occurred in May and June. In contrast, L. unicolor increased very little in size during the winter and grew very rapidly during June and early July, reaching a maximum larval density of 320/m2 and with an instantaneous growth rate (March through July) of 2.7%/d. Production of L. cascadense was estimated as 0.31 g°m-2°yr-1 and that of L. unicolor was 0.23 g°m-2°yr-1. In addition to temporal separation in periods of maximum growth, the two species occurred in different microhabitats. L. cascadense larvae were found within the sediments and debris while L. unicolor occurred on the surface of the debris. Laboratory studies were conducted with L. unicolor larvae. Consumption and fecal production rates (measured gravimetrically) increased with higher temperature, greater food density, or longer conditioning time of the food, and decreases with increased size of the larvae. Production and biomass of L. cascadense and L. unicolor in Mack Creek are minor in relation to other insects in the system. However, because of high consumption rates and low assimilation efficiency, the processing of large particulate organic matter by these two species contributed significantly to the food available to collectors in the study area."

Jones,TS and Resh,VH 1988 Movements of adult aquatic insects along a Montana (USA) springbrook. Aquatic insects, 10(2), 99-104. PDF
     Abstract: " The occurrence and movement patterns of adult insects along a forested springbrook near Flathead Lake, Montana, USA, were studied during three 15-day periods from 19 June through 9 August 1985, using a two-sided Malaise trap. Of the Plecoptera, numbers of males and gravid females of Malenka flexura gravid females of Zapada frigida and total numbers of Paraperla wilsoni were significantly higher for downstream-flying adults during one to three periods. Of the Trichoptera, numbers of males of Anagepetus debilis were significantly higher for upstream flying adults during one period, and males of Lepidostoma cascadense and gravid females of L. spicata were significantly higher for downstream-flying adults during another period. In none of the 26 species examined in these three orders did females show a statistically significant pattern of upstream flight."

Myers,MJ and Resh,VH 2002 Trichoptera and other macroinvertebrates in springs of the Great Basin: species composition, richness, and distribution. Western North American Naturalist 62(1) 1-13. PDF
     Quote from page 6: "We collected a total of 58 different species in 14 different families of caddisflies (Table 5). Four to 18 species were found in a spring. Several springs had very similar physicochemical characteristics; however, none had identical trichopteran composition. Although Lepidostoma cascadense and Rhyacophila brunnea were restricted to cold springs, they were collected from the most springs (12 each). Lepidostoma rayneri, L. roafi, and L. unicolor were also frequently collected (10, 8, and 7 springs, respectively). Across the region (including all 170 springs surveyed), Hesperophylax designatus was the most commonly encountered caddisfly. It was found in temporary springs, springs impacted by grazing, very cold springs at high elevations, and a few of the warmer (14°C), low-elevation springs. Of the 28 springs intensively studied, it was present in 11."

Milne,LJ 1936 Studies in North American Trichoptera. Part 3. Cambridge, Mass. : Author's publication. 128 pages

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