"Everyone in the control room let out a loud 'Oooooh!' at the same time. We were all enchanted," a researcher said.

Scientists uncovered the "mystery mollusk," a strange glowing sea creature lurking in the ocean's midnight depths.

MBARI researchers have discovered a remarkable new species of sea slug that lives in the deep sea. Bathydevius caudactylus swims through the ocean's midnight zone with a large gelatinous hood and paddle-like tail,

More than two decades after spotting a mysterious, gelatinous, bioluminescent creature swimming in the deep sea, California researchers this week announced that it is a new species of sea slug. The Monterey Bay Aquarium Research Institute posted video online of the new sea slug floating gently in the depths.

Advances in technology that enabled the discovery of a new species by California scientists may lead to a better understanding of the ocean’s depths.

Researchers classified the new species within a new genus, Bathydevius, and new family, Bathydeviidae, because of its distinct DNA, physical features, habitat and behavior. The name “Bathydevius” refers to its “deep-living” habitat and “caudactylus” to its “finger-like” tail fringe.