Trichoptera: Glossosomatidae of Gunnison County, ColoradoIntroduction to the caddisfly genus Glossosoma
Saddle Case Makers, Turtle Case Makers, Medium wing, medium brown body cadddis #14-18, Little Tan Short-horn SedgeCurtis 1834
Updated 1 Feb 2010
TSN 117159
These Glossosomatidae pupal cases are firmly attached to the bottom of a rock. They live in streams and rivers throughout the area.
Provisional Species List
Glossosoma parvulum
Glossosoma verdona
Links
On this website:
Agapetus boulderensis
Other Websites:
Photos - from bugguide.net
References
Banks,N 1904 Neuropteroid insects from New Mexico. Transactions of American Entomological Society 32, 97-110.
Banks,N 1911 Descriptions of new species of North American Neuropterid Insects. Transactions of American Entomological Society 37, 335-360.
Canton,SP; Ward,JV 1981 The aquatic insects, with emphasis on Trichoptera, of a Colorado stream affected by coal strip-mine drainage. Southwestern Naturalist 25 4, 453-460.
They studied Trout Creek where it runs through the Edna Coal Mine in northwestern Colorado. The mine spoils were 30 meters from the edge of the creek (approximately a 100 foot buffer zone). They found the aquatic insect density (numbers per square meter) and biomass (weight in grams per square meter) did not change above and below the mine. The Shannon-Weaver Diversity index also showed no difference between sites. However the community structure (which species were present and proportions) did change. Since there were irrigation water and cattle influences at their downstream site, their results may reflect these additional water uses. They note the biggest visible change at this mine is the loss of willow and alder trees downstream of the mine. The caddisfly population changed the most between sites, shifting from a mix of families above the mine to dominance by Hydropsychidae and Glossosomatidae below the mine.
Quote from page 457: "Glossosomatids (Glossosoma ventrale and Agapetus boulderensis) were abundant at both locations. At C2 (upstream of mine) the comprised 33% of the trichopterans; at C4 (below the mine) they clearly dominated the caddisfly community with increased abundance of both species, and accounted for 64% of the density."
Curtis, J. 1834. Descriptions of some hitherto nondescript British species of mayflies of anglers. The London and Edinburgh Philosophical Magazine and Journal of Science 3:212-218.
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.
Dodds GS; Hisaw FL. 1925. Ecological studies on aquatic insects. IV. Altitudinal range and zonation of mayflies, stoneflies and caddisflies in the Colorado Rockies. Ecology 6(4)380-390. Abstract
Gray,LJ; Ward,JV 1979 Food habits of stream benthos at sites of differing food availability. American Midland Naturalist 102 1, 157-167.
Morse, John C. and Lianfang Yang 2004 The world subgenera of Glossosoma Curtis (Trichoptera:Glossosomatidae), with a revision of the chinese species of Glossosoma subgenera synafophora Martynov and protogossa Ross. Proceedings of the Entomological Society of Washington: Vol. 106, No. 1, pp.52–73. Abstract
Peckarsky,BL 1986 Colonization of natural substrates by stream benthos. Canadian Journal of Fisheries and Aquatic Sciences 43, 700-709. Abstract
Ross, HH 1956 Evolution and classification of the mountain caddisflies. University of Illinois Press, Urbana, 213 pages. PDF (in French)
The United States Geological Survey (USGS) National Water Quality Assessment Data Warehouse (NAWQA) shows this genus present in Gunnison County. Data as of 1Sep2005
Voelz,NJ; Poff,NL; Ward,JV 1994 Differential effects of a brief thermal disturbance on caddisflies (Trichoptera) in a regulated river. American Midland Naturalist 132 1, 173-182. PDF
Wiggins, GB 1996 Larvae of the North American Caddisfly Genera (Trichoptera). 2nd Edition. University of Toronto Press, 457 pages.
Wymer,D; Morse,JC 2000 Larvae, pupae and adults of Glossosoma nigrior (Trichoptera: Glossosomatidae), with a review of the eastern North American species of Glossosoma. Entomological News 111 3, 149-158.
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