The Invertebrate of my Choice

The invertebrate of my choice is the Cnidaria. The domain of the my invertebrate is Eukaryote and the kingdom is Animal. Cnidaria, a phylum containing over 10,000 species of animals found exclusively in aquatic environments, are mostly marine species. The name Cnidarian comes from cnidocyte cells, which mostly have a nemoatocyst - a stinging cell that injects a toxin. Only Cnidarians have a nemoatocyst. Cnidarians have no excretory or respiratory system.

Links:
https://en.wikipedia.org/wiki/Cnidaria