Invertebrates
Mushroom Coral
Fungiidae · also called mushroom corals
A mushroom coral rests unattached on a patch of reef rubble, its flattened, ridged surface looking almost exactly like the underside of an oversized mushroom cap. Knock it over, and unlike almost every other stony coral nearby, this one can simply flip itself back upright again.
Overview
The mushroom coral, family Fungiidae, is a free-living, disc-shaped coral found across tropical reef habitat in the Indo-Pacific region. Its lack of permanent attachment to the reef substrate and ability to right itself when overturned set it apart from the fixed, colonial growth form typical of most stony corals.
A coral that doesn’t need to stay put
While most reef corals build their entire existence around permanent attachment, the mushroom coral’s free-living lifestyle lets it occupy sandy and rubble habitat other corals can’t use, and recover from disturbances that would leave an attached colony stranded.
Status
Not Evaluated — widespread across suitable Indo-Pacific reef habitat, though general coral reef threats such as warming and bleaching remain potential concerns.
Mushroom Coral: common questions
Why is the mushroom coral not attached to the reef like other corals?
Unlike most reef-building corals, which grow as permanently attached, multi-polyp colonies, a mushroom coral typically exists as a single large individual polyp that is not permanently fixed to the substrate, an unusual free-living lifestyle among stony corals that allows it to occupy sandy or rubble areas unsuitable for attached species.
Can a mushroom coral really flip itself back over?
Yes, because it is not permanently attached to the substrate, a mushroom coral can actively right itself if flipped over by strong wave action or physical disturbance, using coordinated tissue movement to flip back into its normal upward-facing position rather than remaining stuck upside down.
Why is it called a mushroom coral?
A mushroom coral has a distinctively flattened, rounded, disc-like shape with radiating ridges, an appearance that closely resembles the underside of a mushroom cap, a visual resemblance directly responsible for the common name given to this group of corals.
Where does the mushroom coral live?
Mushroom coral species are found across tropical coral reef habitat throughout the Indo-Pacific region, generally in shallow to moderate depth reef environments, frequently occupying sandy or rubble-strewn areas where permanently attached coral species would struggle to establish themselves.