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Stoneflies - Plecoptera: Chloroperlidae of Gunnison County, Colorado

Suwallia pallidula - Yellow Sallfly

Banks 1904
Updated 18 Mar 2021
TSN 103256

Life History

Dewalt and Stewart (1995) found that July is peak emergence for females. Only two male nymphs were collected in 3 years in the Rio Conejes river in southern Colorado. Extended emergers, adults were present in July and August. Kondratieff and Baumann (2002) note emergence is from late June to August for the state of Colorado.

Locations Collected

Kondratieff and Baumann (2002) note this may be the most common Suwallia in Colorado. Abundant in the middle and higher elevations of the mountains of Colorado.


Older publications may refer to this species as Chloroperla pallidula.

Good Links

On this website:
Introduction to Suwallia

Other Websites:
Map - Kondratieff, Boris C. and Richard W. Baumann (coordinators). 2000. Stoneflies of the United States. Jamestown, ND: Northern Prairie Wildlife Research Center Online. (Version 12DEC2003). http://www.npwrc.usgs.gov/resource/distr/insects/sfly/usa/305.htm

Photos - from Troutnut.com


Alexander,KD; Stewart,KW 1997a Furthur considerations of mate searching behavior and communication in adult stoneflies (Plecoptera); first report of tremulation in Suwallia (Chloroperlidae). In: Ephemeroptera and Plecoptera: Biology-Ecology-Systematics. Eds: Landolt,P; Sartori,M MTL, Fribourg, 107-112.

Alexander,KD; Stewart,KW 1997b The importance of aedeagal characters in species delineation and revision of the stonefly tribe Suwalliini Surdick (Chloroperlidae). In: Ephemeroptera and Plecoptera: Biology-Ecology-Systematics. Eds: Landolt,P; Sartori,M MTL, Fribourg, 484-488.

Alexander,KD; Stewart,KW 1999 Revision of the genus Suwallia Ricker (Plecoptera: Chloroperlidae). Transactions of American Entomological Society 125 3, 185-250.

Banks,N 1904 Neuropteroid insects from New Mexico. Transactions of the American Entomological Society 30:97-110.
     Described as Chloroperla pallidula

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 174: "This species is perhaps the most common and widespread member of the family in the Rocky Mountains. The adults emerge from May to October. "

DeWalt,RE and Stewart,KW 1995 Life histories of stoneflies (Plecoptera) in the Rio Conejos of southern Colorado. Great Basin Naturalist 55, 1-18. PDF

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 " According to the literature, this species may be the most common Suwallia in Colorado, often abundant in middle and higher elevation streams of the Mountain and Plateau regions. Consult Alexander and Stewart (1998) to distinguish adults from the sympatric S. starki. Emergence is generally from late June through August. "

Malison,RL; Ellis,BK; DelVecchia,AG; Jacobson,H; Hand,BK; Luikart,G; Woods,HA; Gamboa,M; Watanabe,K and Stanford,JA 2020 Remarkable anoxia tolerance by stoneflies from a floodplain aquifer. Ecology, 101(10), p.e03127.

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.
     The authors note that S. pallidula was the 3rd most frequently recorded species out of the 100 different stonefly taxa they collected in their survey of Glacier National park and the Flathead basin in northwestern Montana.

Stewart,KW and Stark,BP 2002 Nymphs of North American Stonefly Genera. 2nd edition The Caddis Press, Columbus, Ohio. 510 pages. Illustrations of nymph on pages 278-279, figures 11.19-11.20


subgenital plate

male tergum 9

Brown, Wendy S. 2004 Plecoptera or Stoneflies of Gunnison County, Colorado