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A Mayfly - Tricorythodes explicatus
Other Names:
Tricorythodes minutus
Native Species
Global Rank:
G5
State Rank:
SNR
(see State Rank Reason below)
Agency Status
USFWS:
USFS:
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State Rank Reason (see State Rank above)
Widespread throughout the state, tolerant of silt and warmer temperatures
General Description
This is a very widespread and tolerant mayfly species with triangular operculate gills on the second abdominal segment. Large hatches of this prolific mayfly ("tricos") can be seen in the silted sections of the Missouri, Yellowstone and Clark Fork River Basins. In fact all major river systems provide habitat for this ubiquitous mayfly if silted pool areas provide habitat. This species of mayfly increases in abundance when streams become silted, dewatered and warmer.
Observations in Montana Natural Heritage Program Database
Number of Observations: 361
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Stewardship Responsibility
References
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Baril, S.F. 1977. Benthic invertebrate distribution, abundance, and diversity in Rosebud Creek, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 97 p.- Brammer, J.A. 1991. The effects of supersaturation of dissolved gases on aquatic invertebrates of the Bighorn River downstream of Yellowtail Afterbay Dam. M. Sc. Thesis. Bozeman, MT: Montana State University. 132 p.
- Endicott, C.L. 1996. Responses of riparian and stream ecosystems to varying timing and intensity of livestock grazing in central Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 115 p.
- Fraley, J.J. 1978. Effects of elevated summer water temperatures below Ennis Reservoir on the microinvertebrates of the Madison River, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 120 p.
- Glorvigen, T.H. 1972. The responses of insect communities in the East Gallatin River, Montana, to sewage effluents. M.Sc. Thesis. Bozeman, Montana: Montana State University. 24 p.
- Gustafson, D. L. 1990. Ecology of aquatic insects in the Gallatin River drainage. Ph.D. Dissertation. Bozeman, MT: Montana State University. 194 p.
- Hendricks, P., S. Lenard, D.M. Stagliano, and B.A. Maxell. 2013. Baseline nongame wildlife surveys on the Fort Peck Indian Reservation. Report to the Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation. Montana Natural Heritage Program, Helena, MT. 83 p.
- Oswald, R.A. 1979. Observations of distribution, abundance and production-related aspects of aquatic macroinvertebrates in natural thermal gradients. M.Sc. Thesis. Bozeman, Montana: Montana State University. 137 p.
- Zillges, G.F. Jr. 1971. The aquatic insects of Bluewater Creek, Montana, above and below an area of intensive agriculture. M.Sc. Thesis. Bozeman, MT: Montana State University. 29 p.
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