Two sets of banded tentacles are white, brown, black or orange. The anemone secretes a tube that can extend 1m (3ft) in the mud. Favorite food item of the giant nudibranch.
Large, aggregating, white, orange, tan, or brown anemone. M. giganteum has up to 200 translucent tentacles. It is larger than M. senile. M. senile has fewer than 100 short tentacles. Both are monitored together in survey program.
5 large teeth behind each eye. Fifth pair of legs is slightly flattened. Non-native species. Found in upper intertidal, not likely to be seen by divers.