Paradoris (Paperback)

High Quality Content by WIKIPEDIA articles! Paradoris is a genus of sea slugs, dorid nudibranchs, shell-less marine opisthobranch gastropod mollusks in the family Dorididae.Slug is a common name that is normally applied to any gastropod mollusc that lacks a shell, has a very reduced shell, or has a small internal shell. This is in contrast to the common name snail, which is applied to gastropods that have coiled shells that are big enough to retract into.