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Black-ball sponge
Ircinia strobilina
(Lamarck, 1816)

Ball- or cake-shaped, up to 20 cm high and 23 cm in diameter. Large specimens may show a shallow depression at their upper side, but many specimens are rounded or laterally expanded masses. Coarsely conulose; conules 2-15 mm high and 5-15 mm apart. One or more slight depressions with clusters of oscules; oscules 4-10 mm in diameter (I. strobulia-close up). Consistency tough.

Blackish gray on the upper surface, yellow gray near the base.

Common on reefs, but also on muddy sands and at bottoms at greater depths. Prefer brightly lit areas.

From Florida to the Guyana shelf.

Black-ball sponge (Ircinia strobilina)