Member of a group of snails without shells that breathe through long, feathery gills on their backs. Often considered as 'butterfly of the ocean' due to its beautiful and striking color.

The word "nudibranch" comes from Latin nudus meaning "naked", and Greek brankhia meaning "gills". The name is appropriate since the dorids (infraclass Anthobranchia) breathe through a branchial plume of bushy extremities on their back, rather than using gills. By contrast, on the back of the aeolids in infraclass Cladobranchia there are brightly colored sets of tentacles called cerata.

These sea slugs are soft-bodied snails. The adult form is without a shell or operculum (a bony plate covering the opening of the shell, when the body is withdrawn).
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