Cnidocyte

Definition

A cnidocyte is a specialized cell found in members of the phylum Cnidaria, such as jellyfish, corals, and sea anemones. It contains a stinging organelle called a nematocyst used for prey capture and defense.

5 Must Know Facts For Your Next Test

1. Cnidocytes are unique to the phylum Cnidaria and are crucial for their survival.
2. The nematocyst within a cnidocyte can discharge rapidly to inject toxins into prey or predators.
3. Cnidocytes are usually located on the tentacles but can be found on other parts of the body as well.
4. The discharge mechanism of a nematocyst is one of the fastest cellular processes known in biology.
5. Cnidocytes play a role not only in predation but also in locomotion and attachment.

Review Questions

Related terms

Nematocyst: A specialized organelle within a cnidocyte that ejects toxins to immobilize prey or deter predators.

Tentacle: A flexible, elongated appendage used for feeding, sensation, or locomotion, often bearing cnidocytes.

Polyp:

One of the two main body forms in Cnidarians characterized by a cylindrical shape and tentacles surrounding the mouth opening.