A research group from Nagoya University in central Japan has discovered three new species of bioluminescent polycirrus worms from different parts of Japan. Usually found in shallow water, polycirrus are small worms, known for their bioluminescence. The researchers named one of their discoveries after a ghostly yokai, a creature in Japanese foklore; another after a lantern yokai; and the other after an influential Japanese marine biologist. The researchers published their findings in the journal Royal Society Open Science.