Slug

The word "slug" is also often used as part of the common name of any gastropod mollusc that has no shell, has a very reduced shell, or has only a small internal shell. The unadorned word "slug" is however applied primarily to land slugs, whereas slugs from the sea or from freshwater are usually referred to as "sea slugs" or "freshwater slugs." For more information, visit the Wikipedia entry. Get back to Gastropoda
Banana slug	Brown slug	Red slug