Similarly in the sea slug Glaucus atlanticus, the reverse countershading is associated with inverted habits.
atlanticus preys on other, larger pelagic organisms: the dangerously venomous Portuguese Man o' War Physalia physalis; the by-the-wind-sailor Velella velella; the blue button Porpita porpita; and the violet snail, Janthina janthina.
Scylla et Glaucus | Papilio glaucus | Codex Atlanticus | The sea slug ''Glaucus atlanticus | Glaucus atlanticus | Erigeron glaucus | Emmelichthyops atlanticus | Elymus glaucus | ''C. c. atlanticus'', spring migration, blue morphs in foreground, North Glengarry, Ontario |