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Family Facelinidae

HAWAII

Glaucus atlanticus

Waimanalo Beach, Oahu
Kualoa Beach, Oahu

MAN-O-WAR NUDIBRANCH

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 after being washed ashore by strong winds.  Worldwide in warm seas.