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Ephemeroptera: Heptageniidae of Gunnison County, Colorado

Cinygmula mimus

(Eaton) 1885
Updated 19 April 2017
TSN 100558

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Eaton AE. 1883-1888. A revisional monograph of recent Ephemeridae or mayflies. Transactions of the Linnean Society of London, Second Series, Zoology 3:1-352, 65 plates.

Elmork,K; Saether,OR 1970 Distribution of invertebrates in a high mountain brook in the Colorado Rocky Mountains. University of Colorado Studies Series in Biology No 31.

Flecker,AS and Allan,JD 1988 Flight direction in some Rocky Mountain mayflies (Ephemeroptera), with observations of parasitism. Aquatic Insects 10(1):33-42. PDF

Hamilton,H and Clifford, F 1983 The seasonal food habits of mayfly (Ephemeroptera) nymphs from three Alberta, Canada, streams, with special reference to absolute volume and size of particles ingested. Arch. Hydrobiol., Suppl, 65(2/3), 197-234. PDF

Jensen,SL 1966 The Mayflies of Idaho (Ephemeroptera). M.S. Thesis, University of Utah, Utah. 364 p.
     Quote from pages 154 and 155: "The mimus group, of which this species is a representative, is the most difficult section of the genus. Closely related species probably included in this complex are C. gartrelli McDunnough and C. reticulata McDunnough, both of which are distinguished by characters in the key. However, according to Edmunds (1952b) there is at least one additional undescribed species included under the name of C. mimus, perhaps accounting for much of the variability that this species seems to have. The most noted variable for specimens collected in Idaho is that of size. I have examined specimens assigned to this species with wing lengths ranging from eight to fourteen millimeters with representatives at intermediate measurements. The degree of suffusion of amber on the wings is also variable with some specimens much darker than others. Perhaps once this genus and specifically this complex , is revised our understanding will be much clearer.
Nymphs of this species are found in small to moderate streams usually above elevations of 5,000 feet, on rocks and among gravel. Adults swarm in the early evening and on cloudy days, usually from 3-5 feet over riffles in the stream. They have been colected from May to August."

McCafferty,WP; Durfee,RS; Kondratieff,BC 1993 Colorado mayflies (Ephemeroptera): an annotated inventory. Southwestern Naturalist 38 3, 252-274. PDF
     They note the Colorado State University (CSU) insect collection has specimens from Cement Creek.

McCafferty,WP and Provonsha, AV The Mayflies of North AmericaSpecies List (Version 12Jan2009)
     Here is the geographic range and synonyms:
Cinygmula mimus (Eaton), 1885 [CAN:FN,NW;USA:FN,NW]
* Cinygma mimus Eaton, 1885 (orig.)
* Rhithrogena mimus (Eaton), 1885 (comb.)

McDunnough,J 1924 New Canadian Ephemeridae with notes, II. Canadian Entomologist 56, 90-98, 113-122, 128-133.
     Discussed as Cinygma mimus.

Peckarsky,BL 1990 Habitat selection by stream-dwelling predatory stoneflies. Canadian Journal of Fisheries and Aquatic Sciences 48, 1069-1076.

Peckarsky,BL 1991a A field test of resource depression by predatory stonefly larvae. Oikos 61 1, 3-10.

Slater, J.; Kondratieff, B. C. 2004 A review of the mayfly genus Cinygmula McDunnough (Ephemeroptera: Heptageniidae) in Colorado. J. Kansas Entomol. Soc. 77(2): 121-126. PDF

Ward,JV and Berner,L 1980 Abundance and altitudinal distribution of Ephemeroptera in a Rocky Mountain stream. In Advances in Ephemeroptera biology (pp. 169-177). Springer US. PDF

Brown,WS 2004 Mayflies (Ephemeroptera) of Gunnison County, Colorado, USA