A slender transparent worm-like animal with fins, having spines on the head for grasping prey. It is common in marine plankton. Also called chaetognath.
- Phylum Chaetognatha.
- Chaetognaths (commonly named arrow worms) are transparent marine metazoans, ranging in size from 2 to 120 mm.
- As mentioned, the chaetognaths (‘arrow worms’) are clearly orthodox bilaterians.
- Early Cambrian ‘protoconodonts’ are currently believed to be the unrelated remains of chaetognaths (or ‘arrow worms’).
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