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Stoneflies - Plecoptera: Taeniopterygidae of Gunnison County, Colorado

Doddsia occidentalis Western Willowfly

(Banks 1900)
Updated 25 Aug 2009


Referred to as Brachyptera (subgenus Doddsia) occidentalis in Stark et al (1973). This is a monotypic genus (a genus with only one species), endemic to western North America. Adults have 2 ocelli and wings mottled like Zapada (Baumann et al 1977).


Commonly found at high elevations (above 3000 meters) in creeks and small rivers.

Life History

Adults emerge from February to May.

Locations Collected

Spring Creek (Stark et al 1973)


Older publications may refer to this species as Taeniopteryx occidentalis.

Good Links

On this website:
Key to Taeniopterygidae Nymphs
Key to Taeniopterygidae Males
Key to Taeniopterygidae Females

Other Websites:
Photos, Map, Museum specimens, DNA - Barcodinglife.org

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/230.htm


Banks, N. 1900 New genera and species of nearctic Neuropteroid insects. Transactions of the American Entomological Society 26:239-259.
     Described as Taeniopteryx occidentalis.

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 50: "Nymphs are found in small rivers or streams at fairly high elevations. The adults emerge from February to May. "

Carlisle,Daren M; Clements,William H 2003 Growth and secondary production of aquatic insects along a gradient of Zn contamination in Rocky Mountain streams. Journal North American Benthological Society 22(4), 582-597. Abstract and entire paper

Duffield,RM and Nelson,CH 1998 Stoneflies (Plecoptera) in the diet of brook trout (Salvelinus fontinalis Mitchell) in Libby Creek, Wyoming, USA. Hydrobiologia 380, 59-65.
     Although collected as adults in the streamside vegetation, Doddsia occidentalis was not found in the stomach contents of the trout living in the stream.

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 392: " Nymphs can be very common in high elevations streams (3,000 m) throughout the Mountain region."

Needham,JG and Claassen,PW 1925 A Monograph of the Plecoptera of North America. Entomological Society of America, Lafayette, Indiana. 397 pages.

Stewart,KW and Stark,BP 2002 Nymphs of North American Stonefly Genera. 2nd edition The Caddis Press, Columbus, Ohio. 510 pages.
     There is an excellent set of scanning electron photographs of D. occidentalis mouthparts on page 89, figure 5.4

Stark,BP; Oblad,BR; Gaufin,AR 1973 An annotated list of the Stoneflies (Plecoptera) of Colorado Part I. Entomological News 84 9, 269-277.

Stewart,KW; Harper,PP 1996 Plecoptera. In: An Introduction to the Aquatic Insects of North America. 3rd ed. Eds: Merritt,RW; Cummins,KW Kendall/Hunt Publishing Company, Dubuque, Iowa, 217-266.
     Illustration of larval hair fringe on page 226, figure 14.16

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 230-231, figures 10.3-10.4


nymph cerci

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