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Black-ball sponge
Ircinia strobilina
(Lamarck, 1816)

Description:
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.

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

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

Distribution:
From Florida to the Guyana shelf.

Black-ball sponge (Ircinia strobilina)