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Ventricaria ventricosa
Photo take at -35 ft on a coral reef, very common to see them they are realy a beauty each of this alga.This alga forms large, thin-walled, round or elliptical sacs. The sacs are single cells, among the largest known and may nearly be 5 cm long. Dark green in color with a bright reflective sheen, often covered with thin, silvery to light lavender alga.
Attached to hard objects by fine, hair-like runners, in shallow water and in turtle grass beds. Tend to be solitary, but occasionally in small groups. Found from Florida all the Caribbean sea , Central America to Brazil.