Question

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

Answer 1

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.