- Actinia, genus Actinia - a genus of sea anemone common in rock pools
--1 is a kind of coelenterate genus
--1 is a member of Actiniaria, order Actiniaria, Actinaria, order Actinaria - actinia, actinian, actiniarian - any sea anemone or related animal
--2 is a kind of sea anemone, anemone
--2 is a member of Actiniaria, order Actiniaria, Actinaria, order Actinaria