Trichoptera: Glossosomatidae of Gunnison County, ColoradoGlossosoma parvulum
Saddle Case MakersBanks, 1904
Updated 20 January 2026
TSN 117204
Locations Collected
The Illinois Natural History Survey (INHS) Database has records from the East River at Almont and Tomichi Creek at CO HWY 114, Gunnison and Parlin. A record for Estes Park in Gunnison County may be erroneous.
Good Links
On this website:
Glossosoma Introduction
Other Websites:
Photos, Map, Taxon Identifier Numbers - from the Global Biodiversity Information Facility Glossosoma parvulum at GBIF
Photos, Map, Museum specimens, DNA - Barcodinglife.org
References
Banks,N 1904 Neuropteroid insects from New Mexico. Transactions of American Entomological Society 32, 97-110.
Described as Glossosoma parvula.
Herrmann,SJ; Ruiter,DE and Unzicker,JD 1986 Distribution and records of Colorado Trichoptera. Southwestern Naturalist 31 4, 421-457. Abstract and first page
They note the habitat for this species is streams and rivers, the altitudinal range is 1516 to 2911m and adult collection dates are 6 April to 20 October. Quote from page 426: "This species is widespread and common in Colorado." They list this species as present in Gunnison county.
Ross,HH 1938 Lectotypes of North American caddis flies in the Museum of Comparative Zoology. Psyche 45:1-61 PDF
Ruse,LP and Herrmann,SJ 2000 Plecoptera and Trichoptera species distribution related to environmental characteristics of the metal-polluted Arkansas River, Colorado. Western North American Naturalist 60 (1) 57-65. PDF
Voelz,NJ; Poff,NL and Ward,JV 1994 Differential effects of a brief thermal disturbance on caddisflies (Trichoptera) in a regulated river. American Midland Naturalist 132 1, 173-PDF
Abstract: " During studies on filter-feeding and grazing caddisflies in the regulated upper Colorado River, a problem developed with the deep-release mechanism of Granby Dam and water had to be released from the surface for 16 days in August 1986. Maximum water temperatures exceeded the normal summer maxima by at least 4-5 C for up to 12 km below the reservoir. Samples taken along the longitudinal profile below the reservoir showed that populations of several caddisflies species, which had been numerically abundant in previous years, were virtually eliminated after this period of increased water temperature. Some species experienced immediate reductions, presumably due to larval/pupal mortality (e.g., Brachycentrus americanus, Glossosoma ventrale, G. parvulum), while others exhibited lagged responses over the next several months, presumably due to reduced hatching success and extensive winter mortality (e.g., Glossosoma verdona). Interestingly, at some sites, B. americanus and other caddisfly species were largely unaffected by the elevated temperatures. Species showing the greatest resilience to the thermal disturbance were either those having abundant terrestrial adults present at the time (e.g., Agapetus boulderensis) or those potentially having broad thermal tolerances (e.g., Brachycentrus occidentalis). Most studies concerning the effects of extreme temperature change on lotic organisms have dealt with heated effluents or the general thermal impacts induced by river regulation. This is the first report, that we are aware of, detailing the potential effect of short-term elevated temperatures on lotic macroinvertebrates in a river regulated by a deep-release dani."
Ward,JV 1981 Altitudinal distribution and abundance of Trichoptera in a Rocky Mountain stream. In Proceedings of the Third International Symposium on Trichoptera (pp. 375-381). Springer Netherlands. Abstract
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 64: "This is the most widespread Glossosoma species in Colorado (Herrmann and others, 1986) occurring throughout SPRB from just east of the mountain plains interface to nearly timberline." The elevation range is 4,950-9,200 feet and the adults emerge from May-September.
Brown,WS 2005 Trichoptera of Gunnison County, Colorado, USA
www.gunnisoninsects.org
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