A member of the phylum Chaetognatha, small marine animals commonly known as arrow worms, which are abundant zooplankton in ocean ecosystems.
From Greek 'chaete' (bristle) and 'gnathos' (jaw), describing the distinctive bristle-like appendages near their mouths that resemble jaws.
Arrow worms are invisible ocean ninjas—they're so transparent that they're nearly invisible to prey, yet they're fierce predators that eat thousands of copepods daily, making them crucial links in marine food webs that support whales and fish!
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