Relating to or characteristic of chaetognaths, the phylum of arrow worms.
Derived from Chaetognatha with the adjectival suffix '-an,' following the standard naming convention in taxonomy for relating words back to larger biological classifications.
Scientists initially thought chaetognathans were jellyfish relatives, but DNA testing revealed they're actually in their own unique branch of the evolutionary tree—a reminder that ocean life is far stranger than it looks.
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