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Montana Field Guide

Montana Field Guides

Fragile Ancylid - Ferrissia fragilis


Global Rank: G5Q
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:


 

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General Description
Ferrissia fragilis is a species of small freshwater snail or limpet, an aquatic gastropod mollusk in the family Planorbidae. They are small and conical shaped. Although this species can occur in rivers, it is more commonly found on macrophytes and organic debris in lentic environments (McMahon 1976 and Jokinen 1978).

Range Comments
Currently known from the Seeley Lake chain of lakes, but will probably increase its MT range with more surveys.

Summary of Observations Submitted for Montana
Number of Observations: 2

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Relative Density

Recency

 

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



Habitat
Although it can occur in rivers, it is more commonly found on macrophytes and organic debris in lentic environments (McMahon 1976 and Jokinen 1978).

References
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Citation for data on this website:
Fragile Ancylid — Ferrissia fragilis.  Montana Field Guide.  .  Retrieved on , from