They form tree-like pink colonies, which are 2.5 cm long and irregularly branched.
They have small erect hydroids.
Like other cnidaria these tiny predators have tentacles with stinging cells (nematocysts) that are used to paralyse or kill their prey.
Most of their life is spend as a sessile polyp (growing in colonies).
They are dispersed by releasing medusa (jellyfish-like) which can swim to new areas, or be carried by ocean currents.