Deep in the ocean's mysterious 'midnight zone,' researchers have stumbled upon a new species of glowing sea slug. The Monterey Bay Aquarium Research Institute (MBARI) announced the discovery of Bathydevius caudactylus, a creature so unique it was initially dubbed the 'mystery mollusk.' And honestly, 'mystery mollusk' sounds like something straight out of a sci-fi movie.

The name Bathydevius itself is a nod to the animal's 'devious' nature, having eluded scientists for years. This nudibranch, or sea slug, is the first of its kind known to inhabit the deep sea. Sporting a large gelatinous hood and a paddle-like tail, it also boasts the ability to glow with bioluminescence.

Living at depths of 1,000 to 4,000 meters (3,300 to 13,100 feet), this creature presented a significant challenge to researchers. "We’ve invested more than 20 years in understanding the natural history of this fascinating species of nudibranch," said MBARI Senior Scientist Bruce Robison. "Our discovery is a new piece of the puzzle that can help better understand the largest habitat on Earth." It's kind of amazing how much time and effort goes into understanding one little slug, right?

Bathydevius has evolved some pretty clever survival strategies. It uses its hood to trap crustaceans, much like a Venus flytrap. Its transparent body also helps it hide from predators in plain sight. But if threatened, it lights up with bioluminescence to deter attackers. Researchers even witnessed it detach a glowing piece of its tail as a decoy.

Like other nudibranchs, Bathydevius is a hermaphrodite. Researchers observed that it descends to the seafloor to spawn, using its muscular foot to anchor itself before releasing its eggs. MBARI scientists credit their advanced underwater technology for enabling them to create the most comprehensive description of any deep-sea creature to date.

"What is exciting to me about the mystery mollusk is that it exemplifies how much we are learning as we spend more time in the deep sea, particularly below 2,000 meters," said MBARI Senior Scientist Steven Haddock. "For there to be a relatively large, unique, and glowing animal that is in a previously unknown family really underscores the importance of using new technology to catalog this vast environment."

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Glowing Sea Slug Discovered in Ocean's 'Midnight Zone' – Seriously, What Else Is Down There?