What is another word for chaetognatha?
Pronunciation: [kˌiːtəɡnˈaθə] (IPA) 
Chaetognatha, also known as arrow worms, are a group of marine animals that are characterized by their slender, streamlined bodies and a pair of bristle-like appendages. Synonyms for Chaetognatha include spiny-headed worms, shank worms, and arrowhead worms. These aquatic creatures are considered an important part of the marine food chain as they prey on small planktonic animals. They are also an important indicator species for water quality since they are sensitive to changes in their habitat. Chaetognatha are one of the most ancient groups of marine invertebrates and have been present in the oceans for over 500 million years.
