Habitat: Very common between coral rubble, in shallow reefs, seagrass beds, and mangroves. Distribution: Caribbean wide, and Pacific ocean. Characteristics: Massive, lobate to repent branches with fistules that break off easily. Black externally and internally. Smooth surface with scattered membrane bearing oscules (3-5 mm in diameter), located on top of volcano-shaped elevations. Brittle to pulpy in consistency. Notes: Previously reported and identified by M.C. Diaz as Xestospongia carbonaria