Formerly known as the 'mystery mollusk,' this glow-in-the-dark nudibranch is the first of its kind to be seen living in the ocean's ultra-dark midnight zone. Share on Facebook (opens in a new ...

The discoverers say the creature is a surprising new kind of nudibranch, or sea slug. Nudibranchs (Latin for “naked gills”) get their name from that fact that they’re nude, unlike their ...

Most nudibranchs, colourful and ornate sea slugs, live in shallow waters near the bottom, often among coral reefs. However, ...