Franco Banfi / Rounded bubblegum / Bubble coral (Plerogyra sinuosa) with two Gobies (Gobiidae) on it, Lazi Pier, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Constantinos Petrinos / Acoel flatworms (Waminoa sp.) on Bubble Coral (Plerogyra sinuosa) Lembeh Strait, North Sulawesi, Indonesia.

Linda Pitkin / Banggai Cardinalfish (Pterapogon kauderni), sheltering against Bubble Coral (Plerogyra sinuosa) Lembeh Strait, North Sulawesi, Indonesia, February 2016

Georgette Douwma / Acoel flatworms (Waminoa sp) on polyps of Bubble coral (Plerogyra sinuosa) Indonesia. This flatworm can cover the whole surface of some corals, leaving them no way to catch plankton and their symbioti...

Georgette Douwma / Acoel flatworms (Waminoa sp) on polyps of Bubble coral (Plerogyra sinuosa) Indonesia. This flatworm can cover the whole surface of some corals, leaving them no way to catch plankton and their symbioti...

Chris Newbert / Rounded Bubblegum Coral (Plerogyra sinuosa), Coral Sea

Fred Bavendam / Coral Shrimp (Vir philippinensis) living on Rounded Bubblegum Coral (Plerogyra sinuosa) green spots are Acoelous Flatworms, Manado, North Sulawesi, Indonesia

Gary Bell/ Oceanwide / Coral Shrimp (Vir philippinensis) on Rounded Bubblegum Coral (Plerogyra sinuosa), Anilao, Philippines

Gary Bell/ Oceanwide / Coral Shrimp (Vir philippinensis) on Rounded Bubblegum Coral (Plerogyra sinuosa), Anilao, Philippines

Gary Bell/ Oceanwide / Rounded Bubblegum Coral (Plerogyra sinuosa), Great Barrier Reef, Australia

Pete Oxford / Rounded Bubblegum Coral (Plerogyra sinuosa), Raja Ampat Islands, Indonesia

Richard Herrmann / Rounded Bubblegum Coral (Plerogyra sinuosa), Mindoro Island, Philippines