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Montana Field Guide

Montana Field Guides

A Planarid Worm - Polycelis coronata


Global Rank: GNR
State Rank: S5

Agency Status
USFWS:
USFS:
BLM:


 

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General Description
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.

Diagnostic Characteristics
The diagnostic feature that separates this flatworm species from other Turbellarians is the ring of eyes that form a semi-circle across the head.

Range Comments
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.

Summary of Observations Submitted for Montana
Number of Observations: 215

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



References
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Citation for data on this website:
A Planarid Worm — Polycelis coronata.  Montana Field Guide.  .  Retrieved on , from