The Phylum Chaetognatha

Arrow worms

about 50 species
These worms are abundant in marine plankton and feed on microscopic single-celled plants and small planktonic animals. They have a well-developed body cavity, and the elongated body is divided into a head with eyes and horny teeth, a trunk and a tail. There are fins on the side and tail. One genus is not planktonic, butliveson the sea floor. Most species are tropical.

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