The Celtic Sea Slug (Onchidella celtica) is a species of sea slug found in Britain.

This species is similar in shape to the Sea Lemon, but is much smaller, being less than 2cm in length, and is grey and covereding in small bumps. This species is actually more closely related to terrestrial slugs than sea slugs. This species is local, in south west England, and is found under rocks. This species is grey.

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