Thursday, February 23, 2017


A number of genera within the Euphyllidae family expand the polyp tissue during the day to produce grape-like structures called vesicles, which look like a blanket of opaque bubbles masking the surface of the colony (e.g. Physogyra, p. 27 of the Coral Finder).

Some corals in the family Euphyllidae have grape-like bubbles of polyp tissue called vesicles. During the day they often completely mask the coral colony - the genus Physogyra (below).