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Alexander M. Kerr, PhD

Phylum Chaetognatha Number of families 6

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Long, narrow worms that have transparent bodies and that are known for the hooks that they use to catch prey

Photo: Arrow worms are a dominant part of plankton. They prey on copepods, crustaceans, and larval fish, as well as other chaetognaths. (Photo by Animals Animals ©Peter Parks, OSF. Reproduced by permission.)

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