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Syllis is a genus of polychaete worms, which are a type of segmented marine worm. These worms belong to the family Syllidae, which is a large family of small, free-swimming polychaetes. The genus Syllis itself is the type genus for this family.12

Some polychaetes, including those in the genus Syllis, are known to be bioluminescent, meaning they can produce light. In some species, this light production is linked to sexual maturity and swarming behavior, which can be influenced by lunar cycles.3

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