Phyllodesmium briareum

Phyllodesmium briareum is a species of sea slug, an aolid nudibranch, a marine gastropod mollusk in the family Facelinidae.
The length of the slug is 7-25 mm.
Phyllodesmium briareum uses camouflage and it looks like the soft coral Briareum violacea.
This species contains zooxanthellae.