The term ‘chaetognath’ refers to a member of the phylum Chaetognatha, which includes marine worms known as arrow worms. These organisms are characterized by their elongated, streamlined bodies, and they typically have spiny structures (setae) along their bodies. Chaetognaths are predatory and play a significant role in marine food webs, primarily feeding on small planktonic animals. The phylum is distinct for its unique body plan and features, which set chaetognaths apart from other marine invertebrates.
