top of page


Chapter: Cnidarians: Welcome


What makes a cnidaria a cnidaria?

  • Cnidarians are a phylum of invertebrates that includes animals such as jellyfish, sea anemones, corals, and hydrozoans. They are characterized by the presence of stinging cells, called cnidocytes, which they use for defense and to capture their prey. Cnidarians have a simple body plan, consisting of a central gut cavity surrounded by tentacles. They are either sessile or free-swimming and have a life cycle that typically alternates between a sexual and asexual phase. Cnidarians play important roles in marine ecosystems as predators, prey, and as primary producers in coral reef ecosystems. In recent years, cnidarians have received increasing attention due to their sensitivity to changes in the environment, such as rising ocean temperatures and acidification, which threaten the survival of coral reef ecosystems and the numerous species they support.

Chapter: Cnidarians: Text


Chapter: Cnidarians

Background Information

Total discovered species: 14,500+ species
Distribution: Freshwater and marine environment

Commonly Associated Terms

cnidaria, coelenterata

Evolutionary History & Adaptation

Coming Soon

Conservation and Threats

Coming Soon

Additional Resources

Coming Soon

Chapter: Cnidarians: List

Chapter Advisors and Contributors

Avatar 85

John Doe
PhD Entomology

Lead Researcher at Bugtopia

Avatar 84

James Doe
MSc Insect Pest Management

Termite Specialist

Avatar 104

Ann Doe
MSc Aquatic Entomology

Entomologist at BugTech

Chapter: Cnidarians: Our Team
bottom of page