Isocapnia crinita - (Needham and Claassen, 1925)
Hooked Snowfly
Taxonomic Status: Accepted
Related ITIS Name(s): Isocapnia crinita (Needham and Claassen, 1925) (TSN 102749)
French Common Names: Capnie chevelue
Unique Identifier: ELEMENT_GLOBAL.2.113780
Element Code: IIPLE05030
Informal Taxonomy: Animals, Invertebrates - Insects - Stoneflies
 
Kingdom Phylum Class Order Family Genus
Animalia Mandibulata Insecta Plecoptera Capniidae Isocapnia
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Concept Reference
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Concept Reference: Stark, B.P. 1996. Last updated 16 February 2001. North American Stonefly List. Online. Available: http://www.mc.edu/campus/users/stark/Sfly0102.htm.
Concept Reference Code: N96STA01EHUS
Name Used in Concept Reference: Isocapnia crinita
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 24Aug2009
Global Status Last Changed: 24Aug2009
Rounded Global Status: G5 - Secure
Reasons: Zenger and Baumann (2004) list occurrences in Canada in Alberta and Yukon (Stewart and Oswood, 2006); and the United States in Alaska, Colorado, Idaho, Montana, New Mexico, Utah, and Wyoming.
Nation: United States
National Status: N5 (24Aug2009)
Nation: Canada
National Status: N3N5 (27Apr2017)

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Alaska (SNR), Colorado (SNR), Idaho (S4), Montana (S2), New Mexico (SNR), Utah (S1S2), Wyoming (SNR)
Canada Alberta (SU), Manitoba (SU), Saskatchewan (SU), Yukon Territory (S3S5)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent: 200,000 to >2,500,000 square km (about 80,000 to >1,000,000 square miles)
Range Extent Comments: Zenger and Baumann (2004) list occurrences in Canada in Alberta and Yukon (Stewart and Oswood, 2006); and the United States in Alaska, Colorado, Idaho, Montana, New Mexico, Utah, and Wyoming.

Number of Occurrences:  
Number of Occurrences Comments: Gaufin et al. (1972) cite Montana distribution as Wolf Creek in Flathead Co. Baumann (1973) listed it for Utah. Call and Baumann (2002) cite southern Utah distribution as only Huntington Creek in Emery Co. and Clear Creek in Sevier Co. Newell et al. (2006) report it from Glacier National Park and the Flathead River basin in western Montana.

Other NatureServe Conservation Status Information

Distribution
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Global Range: (200,000 to >2,500,000 square km (about 80,000 to >1,000,000 square miles)) Zenger and Baumann (2004) list occurrences in Canada in Alberta and Yukon (Stewart and Oswood, 2006); and the United States in Alaska, Colorado, Idaho, Montana, New Mexico, Utah, and Wyoming.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map
Endemism: occurs (regularly, as a native taxon) in multiple nations

U.S. & Canada State/Province Distribution
United States AK, CO, ID, MT, NM, UT, WY
Canada AB, MB, SK, YT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
MT Flathead (30029), Gallatin (30031), Lincoln (30053), Missoula (30063)*, Ravalli (30081)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Gallatin (10020008)+
17 Upper Kootenai (17010101)+, Fisher (17010102)+, Bitterroot (17010205)+*, Middle Fork Flathead (17010207)+*, Flathead Lake (17010208)+, South Fork Flathead (17010209)+*, Stillwater (17010210)+, Swan (17010211)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Reproduction Comments: Adults emerge March to May (Gaufin et al., 1972).
Habitat Type: Freshwater
Non-Migrant: N
Locally Migrant: N
Long Distance Migrant: N
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation
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Group Name: Stoneflies

Use Class: Not applicable
Minimum Criteria for an Occurrence: Occurrences are based on some evidence of historical presence or current presence of single or multiple specimens (including nymphs or adults) at a given location with potentially recurring existence. Evidence is derived from reliable published observation or collection data; unpublished, though documented (i.e. government or agency reports, web sites, etc.) observation or collection data; or museum specimen information. A photograph may be accepted as documentation of an element occurrence for adults only (nymphs and subimagos are too difficult to identify in this manner) provided that the photograph shows diagnostic features that clearly delineate the species from other species with similar features. Sight records, though valuable, should not be accepted as the basis for element occurrences. Instead, such records should be utilized to further study an area to verify the element occurrence in that area.
Separation Barriers: Within catchments there are likely no significant barriers to movement of adults between microhabitats, with even extensive sections of inappropriate waterway or major obstructions to flow being readily traversed by adults during dispersal following emergence.
Separation Distance for Unsuitable Habitat: 3 km
Separation Distance for Suitable Habitat: 3 km
Alternate Separation Procedure: None
Separation Justification: Stoneflies (Order Plecoptera) are a relatively small insect order with an immature larval stage that is entirely aquatic in North America. Nymphs of most genera occur in cold lotic habitats, with several occurring in warm lotic systems, comparatively few in cold lentic habitats, and none in warm lentic habitats (Baumann, 1979). Dispersal is primarily accomplished stochastically by nymphs and actively by winged adults; although the adult of Capnia lacustra Jewett, 1965, is entirely aquatic (Jewett, 1962) and Capnura fibula (Claassen, 1924), and Allocapnia vivipara (Claassen, 1924) are apparently wingless (Jewett, 1960). Numbers of described North American species (in nine families) have steadily grown from 350 (Jewett, 1960) to 537 (Stark et al., 1986) to 550 (Stewart and Stark, 1993) to 575 (DeWalt and Stewart, 1995) and most recently 614 (Stark et al., 1998).

Separation distances (unsuitable and suitable) have been set at three km based upon several life history characteristics that limit occurrences to the area of emergence, among them: (1) most stoneflies require some form of moving water for development of nymphs (Hynes in Stark and Armitage, 2000; Jewett, 1960); (2) although some species occur in cool lentic habitats, no stonefly genera occur in warm lentic habitats and most cool lentic taxa live along active, wave-swept areas of shorelines (Hynes in Stark and Armitage, 2000; Stark et al., 1996); (3) although drift does occur for some species, drft tendency is low for stoneflies (Stewart and Szczytko, 1983); (4) stonefly adults generally remain in the area (within m) of larval emergence and mate on nearby solid substratum (Brittain, 1990; Bubb et al., 2004; Cummins and Merritt, 1996); (5) the known life cycle of North American stoneflies is either univoltine (one year) or semivoltine (two or three years) (Hynes in Stark and Armitage, 2000; Stewart and Ricker, 1997; Stewart and Stark, 1993); (6) flying ability (particularly for adult females) is not strong with dispersal rarely exceeding a few km (Malmqvist, 2000) wherein, according to Stewart and Stark (1993), "most students of plecopteran biogeography have emphasized low vagility of adult stoneflies and the necessity for former land bridges or vicariant events to account for range disjunctions"; (7) recently, limited wind-driven dispersal of adults between tributaries has been demonstrated wherein Bubb et al. (2004) showed that between 0.1% and 0.2% of a population of Leuctra inermis moved a distance of 1 km while a very small percentage of a population of Peltoperla tarteri demonstrated genetic flow over 0.5 to 2.0 km (Schultheis et al., 2002).

Date: 18Oct2004
Author: Cordeiro, J.
Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 24Aug2009
NatureServe Conservation Status Factors Author: Cordeiro, J.

Zoological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).

References
Help
  • Baumann, R.W. 1973. Studies on Utah stoneflies (Plecoptera). Great Basin Naturalist 33:91-108.

  • Call, R.G. and R.W. Baumann. 2002. Stoneflies (Plecoptera) of southern Utah with an updated checklist of Utah species. Monographs of the Western North American Naturalist 1:65-89.

  • Gaufin, A.R., E.R. Ricker, M. Miner, P. Milam, and R.A. Hays. 1972. The stoneflies (Plecoptera) of Montana. Transactions of the American Entomological Society 98(1):1-161.

  • General Status 2015, Environment Canada. 2014. Manitoba Ephemeroptera, Trichoptera, Mecoptera, and Plecoptera species lists and ranks proposed by experts.

  • Jacobi, G.Z., S.J. Cary, and R.W. Baumann. 2005. An updated list of the stoneflies (Plecoptera) of New Mexico, U.S.A. Entomological News 116(1): 29-34

  • Kruse, Jim. 2003. University of Alaska Museum Insect Omnibus: a Preliminary checklist of the Insects of Alaska. Order Plecoptera, Stoneflies. Available: http:/www.uaf.edu/museum/Insect_Omnibus/Plecoptera/index. Updated 7 April 2003. Accessed: 16 April 2003

  • Newell, R.L., R.W. Baumann, and J.A. Stanford. 2006. Pages 173-186 in F.R. Hauer, J.A. Stanford, and R.L. Newell. 2006. International Advances in the Ecology, Zoogeography, and Systematics of Mayflies and Stoneflies. University of California Press, Ecology series, Volume 128. 311 pp.

  • Stark, B. P., K. W. Stewart, S. W. Szczytko, R. W. Baumann, and B. C. Kondratieff. 2012. Scientific and common names of Nearctic stoneflies (Plecoptera), with corrections and additions to the list. The Caddis Press, Miscellaneous Contribution No. 1. 20 pp.

  • Stark, B.P. 1996. Last updated 16 February 2001. North American Stonefly List. Online. Available: http://www.mc.edu/campus/users/stark/Sfly0102.htm.

  • Stewart, K.W. and M.W. Oswood. 2006. The Stoneflies (Plecoptera) of Alaska and Western Canada. The Caddis Press: Columbus, Ohio. 325 pp.

  • Stewart, K.W. and W.E. Ricker. 1997. Stoneflies (Plecoptera) of the Yukon. Pages 201-222 in H.V. Danks and J.A. Downes (eds.), Insects of the Yukon. Biological Survey of Canada (Terrestrial Arthropods): Ottawa. 1034 pp.

  • Zenger, J.T., and R.W. Baumann. 2004. The holarctic winter stonefly genus Isocapnia, with an emphasis on the North American fauna (Plecoptera: Capniidae). Monographs of the Western North American Naturalist 2:65-95.

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