Hydrozoans A relative of the jellyfish and corals, hydrozoans are stinging animals found in the coral reefs. Injuries involving Hydrozoans Hydrozoans, like the jellyfish, have nematocysts, or stinging cells, that puncture the skin and injects highly toxic, and sometimes lethal venom into the victim's body.
Hydroids are plant-like animals.
They look like plants. Fire corals look like hard corals, but upon closer observation, they often have a furry coat layer. As it is already, its menacing looks is enough to make one panic. It is not a jellyfish, however. Signs and Symptoms All deliver painful stings upon contact, somewhat like a burning sensation.