cnidarian Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that th ...

anatomy, acontias (singular acontia) are threadlike tissues, composed largely of stinging cells located in the coelenteron of certain

sea anemones Sea anemones are a group of predatory marine invertebrates of the order Actiniaria. Because of their colourful appearance, they are named after the ''Anemone'', a terrestrial flowering plant. Sea anemones are classified in the phylum Cnidaria, ...

. They are thrown out of the mouth or special pores when irritated.

References

Cnidarian biology {{Cnidarian-anatomy-stub