Cnidocyte
Cnidocyte (pronounced: /ˈnaɪdoʊsaɪt/) is a specialized cell found in Cnidarians, a group of aquatic invertebrates that includes jellyfish, sea anemones, and corals. The primary function of cnidocytes is to capture prey and defend against predators.
Etymology
The term "Cnidocyte" is derived from the Greek words "cnidos" meaning nettle and "kytos" meaning cell.
Function
Cnidocytes contain a sub-cellular organelle called a cnidocyst, which is responsible for the stinging sensation associated with many cnidarians. When triggered, the cnidocyst ejects a barbed thread that can penetrate the skin of other organisms and deliver toxins.
Types of Cnidocytes
There are three main types of cnidocytes: Nematocysts, Spirocysts, and Ptychocysts. Nematocysts are the most common and are responsible for the stinging sensation in humans when they come into contact with a jellyfish. Spirocysts are used to entangle prey, while Ptychocysts are used in the construction of tubular homes in some species of sea anemones.
Related Terms
- Cnidarian: The phylum of aquatic invertebrates that cnidocytes are found in.
- Cnidocyst: The sub-cellular organelle found within cnidocytes.
- Nematocyst: A type of cnidocyte that delivers a stinging sensation.
- Spirocyst: A type of cnidocyte used to entangle prey.
- Ptychocyst: A type of cnidocyte used in the construction of tubular homes in some species of sea anemones.
External links
- Medical encyclopedia article on Cnidocyte
- Wikipedia's article - Cnidocyte
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