Stoneflies - Plecoptera: Capniidae of Gunnison County, Colorado
Capnia coloradensisClaassen 1937
Colorado Snowfly, Winter Stonefly, Little Stoneflies
Updated 3 Dec 2017
On this website:
Photos, Map, Museum specimens, DNA - Barcodinglife.org
Baumann,RW, Gaufin,AR and Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society (31) 1-208.
Quoted from page 66: "This species is common in creeks and rivers. The adults emerge in March and April."
Claassen,PW 1937 New species of stoneflies (Plecoptera). Canadian Entomologist (69) 79-82. Type specimen (female) and Type specimen (male)
Gaufin,AR; Ricker,ER; Miner,M; Milam,P and Hays,RA 1972 The stoneflies (Plecoptera) of Montana. Transactions of the American Entomological Society 98(1):1-161.
Knight,AW; Gaufin,AR 1966 Altitudinal distribution of stoneflies (Plecoptera) in a Rocky Mountain drainage system. Journal of the Kansas Entomological Society 39 4, 668-675. Abstract and first page
They studied stoneflies in the South Fork of the Gunnison River Drainage between 6760 and 10,770 feet.
Kondratieff,BC and Baumann,RW 2002 A review of the stoneflies of Colorado with description of a new species of Capnia (Plecoptera: Capniidae). Transactions of American Entomological Society 128 3, 385-401.
Quote from page 387: " Capnia coloradensis is a species commonly occurring in many mountain and higher elevations streams and small rivers of Colorado (Baumann et al 1977, Nelson and Baumann 1989)."
Nelson,RC; Baumann,RW 1989 Systematics and distribution of the winter stonefly genus Capnia (Plecoptera: Capniidae) in North America. Great Basin Naturalist (49) 289-363. PDF
Diagnoses from pages 108 and 110: "The male of this species may be distinguished from any other in the genus by its having a tubelike epiproct, wth the extreme tip dropping downward as a blunt extension, and a prominent tergal knob on segment 8. The female has a subgenital plate similar to that of some of the members of the decepta group, a dark, heavily sclerotized plate which has several lighter lines running longitudinally. The female has a darker plate than the other members of this group, Ricker (1965) was correct in redescribing the female of this species; the female drawing given by Claassen (1937) appears to be Utacapnia logana (Nebeker and Gaufin). The record of C. decepta (Banks 1907b, as Arsapnia decepta) from Alberta is most probably a female of this species."
They looked at a specimen from Gunnison County among many other places. C. coloradensis is placed in the coloradensis group.
Ricker,WE 1965 New records and descriptions of Plecoptera (Class Insecta). Journal of the Fisheries Board of Canada, 22(2) 475-501.
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 (No. 606). US Geological Survey. PDF - caution 46MB
Elevation collected between 6,150 and 10,800ft Adults were found February-July. Remarks from page 38: "This common winter stonefly originally described from El Paso County, Colorado, is generally associated with streams and small rivers at higher elevations in the state (Baumann and others, 1977; Nelson and Baumann, 1989)."