Oregon Department of Agriculture guides
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Start here: Slug or Snail? 

Slugs have: 
  • no visible shell or a small shell that cannot contain their body.
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Continue to slugs
Snails have:
  • a coiled shell that can contain most or all of their body.
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Continue to snails

Slugs

Parts of a slug

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Common slug identification key

With visible shell
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Without visible shell
1. Pneumostome in anterior half of mantle
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2. Pneumostome in middle or posterior half of mantle.
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