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Odontosyllis is a genus of polychaete worms belonging to the family Syllidae. These annelids are known for being bioluminescent, particularly during their breeding periods.1

Annelids, in general, are a phylum of invertebrate animals characterized by a segmented body, a body cavity called a coelom, and movable bristles known as setae. This phylum includes marine worms (Polychaeta), earthworms (Oligochaeta), and leeches (Hirudinea).2

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2 Britannica Sources
  1. Odontosyllis
  2. annelid

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