The oral disc is no wider than the column, and has a central mouth surrounded by up to 200 long, slender tentacles.

[2] Sea anemones are predators, catching prey with their tentacles and immobilising it with their stinging cells.

[4] This species reproduces by basal laceration;[2] as the animal moves on its base across the substrate, a chunk of tissue becomes detached and in time, develops into a new individual.

[4][5] If attacked, this species can discharge acontia (long threads with stinging cells) through its mouth.

[6] Diadumene cincta is often an important member of the communities of which it is a part; on the projecting parts of wrecks on the continental shelf of Holland, it is dominant along with the breadcrumb sponge Halichondria panicea and the cave-dwelling anemone Sagartia troglodytes.