Home > Invertebrates > Slugs > Facelinidae > Glaucus atlanticus

Updated 12/28/2012

Family Facelinidae


Glaucus atlanticus

Waimanalo Beach, Oahu


Kailua Beach, Oahu


Kualoa Beach, Oahu

Pualenalena Beach, Maui


Pelagic slug that floats on the sea surface and preys upon Portuguese Man-of-War.  Stores stinging cells (nematocysts) from the Man-of-war in its finger-like cerata for defense.  Attains 1.5 inch.  Typically encountered as a blue & silver lump washed ashore by strong onshore winds.  Worldwide in warm seas.