Plecoptera: Nemouridae of Gunnison County, ColoradoZapada oregonensis
Oregon Forestfly, Early Winter Brown (Claassen) 1923
Updated 25 July 2009
Description
Very similar to Zapada haysi, but usually doesn't appear sympatrically or at the same time and place (Kondratieff and Baumann 2002). The nymphs are impossible to tell apart from Z. haysi.
Habitat
Less common than Z. haysi in Colorado. Found in creeks, small rivers and especially in the northern part of the state.
Life History
Nymphs studied by Short and Ward (1981) ate detritus while living in a 3rd order stream.
Locations Collected
White Pine Creek, East Fork Cimmaron Creek.
Notes
The genus Zapada was previously named Nemoura. Older publications may refer to this species as Nemoura oregonensis.
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References
Baumann, RW Gaufin, AR, Surdick, RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.
Quote from page 48: " This species is common in creeks and small rivers in the Northern Rocky Mountains. The adults emerge from March through August. This species has been recorded from Utah previously, but all specimens seen proved to be Zapada haysi (Ricker)." They mention Zapada oregonensis is present in Gunnison County.
Claassen,PW 1923 New species of North American Plecoptera. Canadian Entomologist 55, 257-263,281-292.
Frison,TH 1937 II. Descriptions of Plecoptera with special reference to the Illinois species. Illinois Natural History Survey Bulletin 21 3, 78-99.
Discussed as Nemoura oregonensis. Illustrations of female front wing and terminal abdominal segments (Figure 70 on page 84).
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. They refer to this species as Nemoura oregonensis
Kondratieff,BC; 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: "This species is quite similar to Z. haysi, but does not occur sympatrically. However, both species occur at Fish Creek in Routt County"
Needham,JG; Claassen,PW 1925 A Monograph of the Plecoptera of North America. Entomological Society of America, Lafayette, Indiana. 397 pages.
Discussed as Nemoura oregonensis.
Short,RA; Ward,JV 1981 Trophic ecology of three winter stoneflies (Plecoptera). American Midland Naturalist 105, 341-347.
Ward,JV; Kondratieff,BC; Zuellig,RE 2002 An Illustrated Guide to the Mountain Stream Insects of Colorado. 2nd ed. University Press of Colorado, Boulder, Colorado. 219 pages. Buy from Amazon.com
Illustration of Z. oregonensis nymph on page 68, figure 28.
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