nematocyst

(noun)

a capsule, in certain cnidarians, containing a barbed, threadlike tube that delivers a paralyzing sting

Related Terms

Examples of nematocyst in the following topics:

  • Phylum Cnidaria

    • Cnidarians contain specialized cells known as cnidocytes ("stinging cells"), which contain organelles called nematocysts (stingers).
    • Nematocysts contain coiled threads that may bear barbs.
    • Cnidocytes contain large organelles called (a) nematocysts that store a coiled thread and barb.

  • Class Scyphozoa

    • In the jellyfish, a mouth opening, surrounded by tentacles bearing nematocysts, is present on the underside of the animal.

  • Class Anthozoa

    • Anemone fish, or clownfish, are able to live in the anemone since they are immune to the toxins contained within the nematocysts.

  • Class Cubozoa and Class Hydrozoa

    • Nematocysts may be arranged in a spiral configuration along the tentacles; this arrangement helps to effectively subdue and capture prey.