Funiculina quadrangularis, commonly known as tall sea pen, is an uncommon cold water coral within the Family Funiculinidae.

[2] They are also distributed in coastal waters of the North Atlantic and Mediterranean, New Zealand, Japan and the Gulf of Mexico.

The tall sea pan is dioecious, which means that they have the male and females reproductive organs in separate individuals.

Some are guessing that it is due to the influence of environmental cues and this tall sea pen’s deep-sea habitat.

As a result, F. quadrangularis is decreasing in population numbers which may lead them to genetic isolation and reduced diversity.

The tall sea pen is a Species of Principal Importance under the Natural Environment and Rural Communities Act, 2006, UK.