A Mayfly - Drunella doddsii
Within this mayfly genus are several species known to fly-fisherman as "Green Drakes". The more abundant one is D. grandis, but D. doddsi is shorter and burlier looking. This species has a streamlined, flattened body style and has evolved a suction cup of hairs on the underside of the abdomen to allow it cling to rocks and cobbles in very fast sections of rivers. The adult duns look much like beefy blue-winged olives, with green to olive abdomens and 3 tails, however the body ratio is much shorter. These are fairly common in the fast flowing riffle areas of small, cobble streams to larger trout rivers throughout Montana including the upper Yellowstone and tributaries such as the Boulder River and Smith Creek to upper Missouri River streams such as the Gallatin and Big Hole and throughout west of the divide streams. Adults hatch in late spring/early summer.
Larvae take 1 to 2 years to develop depending on watewr temperatures and adults hatch in late spring to early summer (the Green Drake Hatch).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
- Additional ReferencesLegend: View Online Publication
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- 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.
- Garrett, P.A. 1973. The distribution and abundance of aquatic insects in the Middle West Gallatin drainage. M.Sc. Thesis. Bozeman, Montana: Montana State University. 60 p.
- Gustafson, D. L. 1990. Ecology of aquatic insects in the Gallatin River drainage. Ph.D. Dissertation. Bozeman, MT: Montana State University. 194 p.
- Lohr, S.C. 1993. Wetted stream channel, fish-food organisms and trout relative to the wetted perimeter inflection point instream flow method. Ph.D. Dissertation. Montana State University, Bozeman. 246 p.
- McCarty, J.D. 2019. Influence of thermal regime on the life histories and production of Rocky Mountain aquatic insects. M.Sc. Thesis. Bozeman, MT: Montana State University. 67 p.
- Muhlfeld, C.C., T.J. Cline, J.J. Giersch, E. Peitzsch, C. Florentine, D. Jacobsen, and S. Hotaling. 2020. Specialized meltwater biodiversity persists despite widespread deglaciation. Proceedings of the National Academy of Sciences May 2020, 202001697; DOI: 10.1073/pnas.2001697117
- Richards, D.C. 1996. The use of aquatic macroinvertebrates as water quality indicators in mountain streams in Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 192 p.
- Vincent, E.R. 1966. A comparison of riffle insect populations in the Gibbon River above and below the geyser basins, Yellowstone National Park. M.Sc. Thesis. Bozeman, MT: Montana State University. 19 p.
- Additional Sources of Information Related to "Insects"