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Montana Field Guide

Montana Field Guides

Thicklip Rams-horn - Planorbula armigera

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
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Observations in Montana Natural Heritage Program Database
Number of Observations: 1

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Relative Density



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

Planorbids tend to occur in bodies of water with a firm mud bottom and high levels of decaying organic matter. Most species seem to prefer lentic habitats (lakes, wetland or ponds). With the exception of Helisoma anceps which occurs more often in river pools, they prefer minimal current. Planorbid snail are scrapers of benthic surface and have been shown to eat bacterial films and algae.

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Citation for data on this website:
Thicklip Rams-horn — Planorbula armigera.  Montana Field Guide.  .  Retrieved on , from