A Mayfly - Tricorythodes explicatus
(see State Rank Reason below)
State Rank Reason (see State Rank above)
Widespread throughout the state, tolerant of silt and warmer temperatures
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:
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(Observations spanning multiple months or years are excluded from time charts)
- Additional Sources of Information Related to "Insects"