Night Anemone - Phyllodiscus semoni

"Phyllodiscus" is a monotypic genus of sea anemones in the family Aliciidae. The only species is "Phyllodiscus semoni", commonly known as the night anemone, which is native to shallow seas in the central Indo-West Pacific, such as Indonesia, the Philippines and southern Japan. It is venomous and can cause a painful, long-lasting sting to humans. It is called "unbachi-isoginchaku" in Japanese which translates as "wasp-sea anemone".