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Question

What is the fluid-filled capsule in a cnidocyte called?


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Solution

Cnidaria:

  1. Cnidaria, or coelenterate, creatures include jellyfish, sea anemones, corals, and the more recognized Hydra.
  2. They are diploblastic eumetazoans with the tissue-grade organization.
  3. Cnidarians are distinguished by the existence of Cnidocytes, polyps, and medusa forms.

Cnidocyte:

  1. In cnidarians, a cnidocyte is a specialized cell that contains a cnidocyst and is engaged in prey capture.
  2. A nematocyte or a cnidoblast is another name for it.
  3. Tentacles and hypostomes of sea anemones, jellyfish, corals, and hydrae contain cnidocytes
  4. Cnidocytes are fish and crustacean predators.
  5. A nematocyst is a single, large secretory organelle found in them.

Nematocyst:

  1. The tentacles and body of these cnidocytes include a stinging capsule called nematocyte.
  2. These cells are employed for anchoring, defense, and prey capture.
  3. The nematocyst capsule contains a deadly substance known as Hypnotoxin.

Thus, the fluid-filled capsule in a cnidocyte is called a nematocyst.


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