clade Euthyneura clade Nudipleura clade Nudibranchia clade Dexiarchia clade Cladobranchia Facelina marioni Vayssière, 1888 Facelinopsis marioni is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

[2] This species was described from the Rade de Villefranche-sur-Mer, France.

[1] The typical adult size of this species is 10 mm.

[3]