Arrow worms, or chaetognaths, are strange ocean predators that have puzzled scientists for more than a century. They have transparent, torpedo-shaped bodies, sharp grasping spines near their mouths, and sensory structures unlike those of any other animal group. Despite their distinctive look, their place on the evolutionary tree has long been a mystery.



Summary

Arrow worms, or chaetognaths, are enigmatic marine predators known for their transparent, torpedo-shaped bodies and unique grasping spines. Their sensory structures are unlike those found in any other animal, making them distinct within the animal kingdom. Despite their recognizable features, scientists have struggled for over a century to pinpoint their evolutionary origins and place them accurately on the tree of life. Their unique characteristics continue to fascinate and challenge evolutionary biologists.

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