Nudibranch
Depth: 20 m · Sunlight Zone
The nudibranch is a sea snail with no shell at all, and it often glows in bright colors. Those colors are a warning: I taste bad or I am poisonous. Some kinds eat stinging animals and then simply reuse their venom for themselves.
For scientists
Nudibranchs (Nudibranchia) are shell-less sea snails; their often gaudy colors are a warning signal (aposematism). Many take defensive substances from their food: species that eat cnidarians store the undigested stinging cells in skin appendages and use them for their own defense (kleptocnidae). Others even run photosynthesis with algae cells they take in. They are named after their bare, often feathery gills on the back.
Source: Smithsonian Ocean
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