A genus of large sea slugs or sea hares, marine gastropods known for their ability to release ink clouds for defense.
From Greek 'aplystos' (unwashed, unclean, hard to clean). The name derives from the creature's habit of releasing dark clouds of ink, alluding to something not easily washed away.
Aplysia are neuroscience superstars—their giant neurons have only 20,000 nerve cells compared to our billions, making them perfect for studying how memories form, and they taught us that learning changes brain chemistry forever.
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