Cnidocytes

Cnidocytes

Cnidocytes (pronounced: /ˈnaɪdoʊsaɪts/) are specialized cells that are unique to Cnidaria, a phylum of aquatic invertebrates that includes organisms such as jellyfish, sea anemones, and coral.

Etymology

The term "Cnidocytes" is derived from the Greek words "cnidos" which means "stinging nettle" and "kytos" which means "cell".

Function

Cnidocytes are primarily used for capturing prey and for defense against predators. They contain specialized organelles called cnidocysts, which are filled with venomous stinging threads. When triggered, these threads are ejected and can paralyze or kill small prey.

Types of Cnidocytes

There are three main types of cnidocytes: Nematocysts, Spirocysts, and Ptychocysts. Each type has a different function and structure, but all are used for capturing prey or for defense.

Related Terms

• Cnidaria: The phylum of aquatic invertebrates that includes organisms such as jellyfish, sea anemones, and coral.
• Cnidocysts: Specialized organelles within cnidocytes that contain venomous stinging threads.
• Nematocysts: A type of cnidocyte that is most commonly associated with jellyfish stings.
• Spirocysts: A type of cnidocyte found in sea anemones and coral.
• Ptychocysts: A type of cnidocyte that is used to build tube-like structures in certain species of Cnidaria.

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