• The Chaetognatha /kiːˈtɒɡnəθə/ or chaetognaths /ˈkiːtɒɡnæθs/ (meaning bristle-jaws) are a phylum of predatory marine worms that are a major component of plankton worldwide.
  • Chaetognatha (arrow worms) are a small phylum of predatory animals, all of which are marine, including 130 extant species in the class Sagittoidea.
  • The phylum Chaetognatha, also known as arrow worms, contains nearly 200 species of mostly planktonic, bilaterally symmetrical, coelomate, worm-like organisms.
  • A systematic compilation of valid Chaetognatha species diversity and distribution collated from published literature has been undertaken in this chapter.
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  • History of Phylum Chaetognatha: 1. Slabber, in the year 1769, was the first worker to record Sagitta and he placed it in the order Intestina under phylum Vermis.
  • Current Biology 16(15):R593-R596. Bieri, R. 1991. Systematics of the Chaetognatha. Pages 122-136 in: The Biology of Chaetognaths.
  • Invertebrates in the Plankton: Chaetognatha. Chaetognaths are a dominant part of the plankton, outnumbered only by copepods.
  • Phylum Chaetognatha A common name for chaetognaths is arrowworms. They are all marine animals and are highly specialized for their planktonic existence.
  • Chaetognatha Species Count: According to the online database The Catalogue of Life there are 132 recognized species of Arrow Worms.