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Cyerce cristallina is a species of sacoglossan sea slug, a shell-less marine gastropod mollusk in the family Hermaeidae.

Distribution
The Cyerce cristallina can be found throughout the Mediterranean Sea

Chemical defenses
Unlike other Mediterranean Sacoglossans which sequester compounds used to create toxins from the algae they eat, the Cyerce cristallina produces its own toxins 'de novo': within its own body. . These toxins, Cyerecene-A, are excreted from dorsal appendages (cerata) when disturbed. . The cristallina is also capable of detaching these cerata, which continue to secrete the toxins. These toxins are ichthyotoxins, meaning toxic to fish.