Metridium giganteum is an anemone that can be found in and around the Kelp forestes along the Pacific coast of the United States, from Santa Catalina Isl.
In the south and Prince Edward Isl. in Canada it will reach about 50 cm high and has a diameter of 25 cm and is rather higher than wide, but can greatly alter there proportions and usually has more than 100 tentacles.
It`Color varies from light brown to dark brick red and white.
Similar species: Metridium senile has a similar shape and color, but is only up to about 10 inches tall and has less than 100 tentacles.