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("bristle-jaw" / Arrow Worms)

Chapter: Ctenophores: Welcome


What makes a chaetognath a chaetognath?

  • Chaetognatha, also known as arrow worms, are a phylum of small, predatory marine invertebrates. They are characterized by their elongated, slender bodies and their retractable, chitinous spines, which they use for defense and to capture their prey. Chaetognatha are carnivorous and feed on small planktonic organisms, such as copepods and other small crustaceans. They have a simple digestive system and lack a true circulatory system, but have a well-developed nervous system and sense organs. Chaetognatha play an important role in marine food webs as predators, and their abundance and distribution is often used as an indicator of the health of marine ecosystems. Despite their importance, chaetognatha are often overlooked because of their small size and elusive nature.

Chapter: Ctenophores: Text


Chapter: Chaetognaths

Background Information

Total discovered species: 120+ species
Distribution: Coastal and open-ocean environment

Commonly Associated Terms


Evolutionary History & Adaptation

Coming Soon

Conservation and Threats

Coming Soon

Additional Resources

Coming Soon

Chapter: Ctenophores: List

Chapter Advisors and Contributors

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John Doe
PhD Entomology

Lead Researcher at Bugtopia

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James Doe
MSc Insect Pest Management

Termite Specialist

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Ann Doe
MSc Aquatic Entomology

Entomologist at BugTech

Chapter: Ctenophores: Our Team
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