Cnidarian

Cnidarian (South American sea nettle)

Also called coelenterates, cnidarians are any member from the phylum Cnidaria. These include marine animals such as corals, jellyfish, sea anemones, etcetera. The phylum is made up of four classes: Hydrozoa, Scyphozoa, Anthozoa, and Cubozoa. They contain nematocysts (or cnidae), which are venomous, stinging organelles. Their structure is simple, since they mainly just have the capability to digest and distribute nutrients across its gelatinous body.