Genus
Common name: Feather Star
Scientific name: Cavernularia
Cavernularia is a genus of octocorals commonly known as sea pens, named for their resemblance to antique quill pens. Members of this genus are colonial organisms, consisting of a primary polyp that anchors the colony to the substrate and secondary polyps specialized for feeding. They are nocturnal, extending their polyps to feed on plankton at night. Cavernularia species are found in various marine environments but typically inhabit soft sediment areas in deeper waters. They are not common in the reef aquarium trade due to their specific care requirements and the challenge of providing a suitable environment.