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Stoneflies - Plecoptera: Capniidae of Gunnison County, Colorado

Isocapnia crinita - Hooked Snowfly

(Needham and Claassen) 1925
Updated 15 May 2016
TSN 102749


Rare, two of the three records of I. crinita are from Gunnison County (Nelson and Baumann, 1989). The genus Isocapnia was previously included in Capnia. Older publications may refer to this species as Capnia crinita.

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On this website:
Isocapnia grandis
Introduction to Isocapnia


Baumann,RW, Gaufin,AR and Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.
     Quote from page 78: "This rare species occurrs in both creeks and rivers. The adults emerge from March to May. " Illustrations include Figure 232, male terminalia, lateral view; Figure 233 male terminalia dorsal view on page 79.

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 390: "This rare species is presently known from only three localities in Colorado: Gunnison Co., Gunnison River, Gunnison, 18 April 1954, W.E. Ricker, 1 male,1 female (CNC); Routt Co., Yampa River, Hwy 40, eat of Hayden, 9 May 1997, R.W. Baumann, 1 micropterous male (BYU); Saguache Co., Tomichi Creek, Hwy 50, west of Sargents, 7 May 1992, R.W. Baumann, B.C. Kondratieff and J.T. Zenger, 3 micropterous male (CSU, BYU). "

Knight,AW and Gaufin,AR 1966 Altitudinal distribution of stoneflies (Plecoptera) in a Rocky Mountain drainage system. Journal of the Kansas Entomological Society 39(4) 668-675. First page

Nebeker,AV and Gaufin,AR 1967 Geographic and seasonal distribution of the family Capniidae of western North America (Plecoptera). Journal of the Kansas Entomological Society 40(3)415-421 Abstract and first page

Nelson,RC and Baumann,RW 1989 Systematics and distribution of the winter stonefly genus Capnia (Plecoptera: Capniidae) in North America. Great Basin Naturalist 49, 289-363. PDF

Newell,RL; Baumann,RW and Stanford,JA 2008 Stoneflies of Glacier National Park and Flathead River basin, Montana. International Advances in the ecology, zoogeography, and systematics of mayflies and stoneflies. University of California Publications in Entomology, Berkeley and Los Angeles, pp.173-186. PDF
     Quote from page 176: "Stoneflies recorded from hyporheic habitats (pumped wells) included: Alloperla severa, Capnia confusa, Claassenia sabulosa, Diura knowltoni, Hesperoperla pacifica, Isocapnia crinita, I. grandis, I. integra, I. vedderensis, Isoperla fulva, Kathroperla, Paraperla frontalis, and P. wilsoni"

Stanford,JA and Gaufin,AR 1974 Hyporheic communities of two Montana rivers. Science 185:700-702. PDF

Stanford,JA and Ward,JV 1993 An ecosystem perspective of alluvial rivers: connectivity and the hyporheic corridor. Journal of the North American Benthological Society, 48-60.

Brown, WS 2004 Stoneflies or Plecoptera of Gunnison County, Colorado