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Ephemeroptera: Leptohyphidae of Gunnison County, Colorado

Tricorythodes minutus
Trico, Trico Spinner, Tiny white winged black mayfly

Traver 1935
Updated 19 April 2013
TSN 101419

Recently renamed Tricorythodes explicatus (Eaton, 1892).


Baumgardner,DE 2009 Tricorythus minutus Traver, a new synonym of Tricorythodes explicatus Eaton (Ephemeroptera: Leptohyphidae). Proceedings of the Entomological Society of Washington 111(1):57-67. PDF
     Abstract: " Based upon a study of adults, larvae, and reared adults from throughout North and Central America, Tricorythodes minutus Traver, 1935 is shown to be a junior synonym of Tricorythodes explicatus (Eaton, 1892) (n. syn.). Previous characters postulated to separate the two species are shown to be variable and unreliable. This study has clearly revealed the presence of a single, widespread and morphologically variable species distributed throughout much of western, central, and northeastern North America and northern Central America. "

Canton,SP; Cline,LD; Short,R and Ward,JV 1984 The macroinvertebrates and fish of a Colorado stream during a period of fluctuating discharge. Freshwater Biology, 14(3), 311-316. PDF
     SUMMARY. 1. During a 2-year study of the fish and macroinvertebrates of a third-order montane stream, a severe drought in the first year resulted in a temporary cessation of surface flow. Flow was continuous during the second year.
2. Some taxa (e.g. Ophiogomphus severus) exhibited higher density during the drought year, others declined in abundance during low flow (e.g. Baetis spp.), whereas a few (e.g. Tricorythodes minutus) appeared unaffected. Total macroinvertebrate density decreased by 50% during the low flow year compared to the normal flow year. Mayflies were most severely affected, but also exhibited the most dramatic recovery.
3. The collector-gatherer functional feeding group was abundant only during the normal flow year, whereas shredders and predators exhibited increased relative abundance during low flow.
4. Fish populations were severely reduced in the low flow year. However, fishes rapidly invaded the area following resumption of normal flow.

Gilpin,BR and Brusven,MA 1970 Food habits and ecology of mayflies of the St. Maries River in Idaho. Melanderia 4:19-40. PDF

Gray,LJ; Ward,JV; Martinson,R and Bergey,E 1983 Aquatic macroinverterbrates of the Piceance Basin, Colorado: Community response along spatial and temporal gradients of Environmental Conditions. The Southwestern Naturalist, 125-135.

Traver,JR 1935 Part II, Systematic. In: The Biology of Mayflies with a Systematic Account of North American Species. Eds: Needham,JG; Traver,JR; Hsu,YC Comstock Publications, Ithaca, New York, 239-739.

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