A Mayfly - Baetis tricaudatus
(see State Rank Reason below)
State Rank Reason (see State Rank above)
Ubiquitous and abundant across the state.
This is our most widespread and abundant mayfly of running waters in the state; it can be found in small forested mountains stream systems to the largest riffle sections of the Missouri and Yellowstone Rivers.
Baetis tricaudatus larvae are distinguished from other Montana Baetis by having three unbanded caudal filaments (tails), dark bilobed markings on the pronotum, and robust setae on the abdominal sterna, paraprocts, and antennal scape and pedicel.
Baetis tricaudatus is the most widespread Baetis in North America, found in almost every state, being absent only from the extreme southeast (Morihara and McCafferty 1979a).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
- Literature Cited AboveLegend: View Online Publication
- D.K. Morihara, and W.P. McCafferty, 1979 The Baetis larvae of North America (Ephemeroptera: Baetidae). Transactions of American Entomological Society 105, 139-221.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- 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.
- Gustafson, D. L. 1990. Ecology of aquatic insects in the Gallatin River drainage. Ph.D. Dissertation. Bozeman, MT: Montana State University. 194 p.
- Kumar, Anuj. 1999. Effects of Tagetes minuta on the plant parasitic Southern Root-knot Nematode, Meloidogyne incognita, Sugarbeet Cyst Nematode, Heterodera schachtii and nontarget aquatic macroinvertebrates. M.Sc. Thesis. Bozeman, MT: Montana State University. 85 p.
- Novak, M.A. 1988. Impacts of a fire-flood event on physical and biological characteristics of a small mountain stream. M.Sc. Thesis. Bozeman, MT: Montana State University. 98 p.
- Oasis Environmental. 2011. Benthic macroinvertebrate recolonization in the varial zone of the Kootenai River, Montana. Bigfork, MT. Prepared for Montana Fish, Wildlife, and Parks. 79 p.
- 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.
- Sater, S. 2022. The insects of Sevenmile Creek, a pictorial guide to their diversity and ecology. Undergraduate Thesis. Helena, MT: Carroll College. 242 p.
- Additional Sources of Information Related to "Insects"