Cup corals (Balanophyllia) from the sea near Tristan da Cunha. Cup corals can look similar to sea anemones, but are while they belong to the same class Anthozoa, they belong to different Orders. Picture Credit: Sue Scott

Cup corals (Balanophyllia) from the sea near Tristan da Cunha. Cup corals can look similar to sea anemones, but are while they belong to the same class Anthozoa, they belong to different Orders. Picture Credit: Sue Scott