
Chapter:
Cnidarians
Synapomorphies
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.
Resources
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 Advisors and Contributors

John Doe
PhD Entomology
Lead Researcher at Bugtopia

James Doe
MSc Insect Pest Management
Termite Specialist

Ann Doe
MSc Aquatic Entomology
Entomologist at BugTech