It has small invisible tentacles with nematocysts. Locally, effects may vary from minor irritation of the skin to excruciating pain. Nausea and vomiting for a few hours is possible if a large surface of the skin comes in contact with fire coral. The stinging seaweed is an animal that looks like a fern. The color varies between brown and green, but can also be white or purple.
Sensation varies from mild stinging to extreme pain.
The skin turns red after 30 minutes with itchy pustules that can stay for a week. It is an invertebrate also called Lizard Nudibranch. Long of 1-3 cm, usually blue on his dorsal surface and white on his ventral surface. It has a characteristic inflated air pocket. This animal feeds on various nematocysts, and the effects of it's touch varies depending on the nematocyst it consumed.