Zoanthus sociatus, commonly known as the green sea mat or button polyp, is a zoanthid usually found in shallow reef zones of tropical regions from Caribbean to southeastern Brazil.

They are often found on reef flats exposed to high light intensity and intermittently strong currents.

Z. Sociatus can be found in the lower intertidal and upper subtidal zones on protected Caribbean reefs.

Z. sociatus can survive desiccation (an excessive loss of moisture) and lower levels of salinity.

Z. sociatus was found to reproduce seasonally in Panama, and synchronizes the release of gametes with extremely low tides.

While zoanthids are less efficient heterotrophs, they produce more energy photosynthetically due to their lack of a calcified skeleton.