Facelina quadrilineata

Facelina quadrilineata is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

Distribution
This species has been reported from Japan where it is a common species.

Description
This species has a pattern of four lines on the head. Facelina bilineata has been confused with this species in the past.