A Planarid Worm - Polycelis coronata
This flatworm species is a cold-water stenotherm (preferring water tempertures in the range of 6-10 degrees C) and occurs throughout Montana's small mountian streams east and west fo the Continental divide and especially in cold spring-influenced streams and creeks. You can find them clinging underneath cobbles and boulders during the day and patrolling during the evening looking for food, generally scavengers, eating other dead invertebrates or vertebrates.
The diagnostic feature that separates this flatworm species from other Turbellarians is the ring of eyes that form a semi-circle across the head.
This cold-water flatworm occurs throughout Montana's mountian streams east and west fo the Continental divide and especially in cold spring-influenced streams and creeks.
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)