Cnidarian
Jellyfish, corals, sea anemones and hydras: animals with stinging cells.
What it means
Cnidarians take their name from cnidocytes, cells that fire a stinging thread to catch prey and to defend themselves, and which are behind the sting of a jellyfish. Their bodies have radial symmetry and a single opening that serves as both mouth and anus. Many alternate between two forms over their lives: the polyp, attached to the seabed, and the medusa, which swims freely.
Species
Gallery
