Do all coelenterates have cnidocytes?

Yes, almost all species of coelenterates have stinging cells. Stinging cells are specialized cell structures invented by organisms such as jellyfish and corals for defense, hunting, and capturing prey. Coelenterates are a group of animals under the phylum Cnidaria, including sea anemones, jellyfish, gorgonians, corals, jellyfish, etc. They all have many stinging cells distributed on the surface of the body or on certain internal organs.

The stinging cells of coelenterates usually consist of a hollow tube-like structure and a stretchable structure called a "tentacle." These stinging cells can quickly release a venom that attacks and kills enemies or prey. For humans, caution is required when coming into contact with coelenterates, as their toxins can cause skin irritation, swelling, allergic reactions and other uncomfortable symptoms that can even be life-threatening.

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