Habitat: Bores into coral heads by secreting minute amounts of acid. From the exterior there is usually no visible damage. Very common species on shallow to deeper reefs (> 4 m deep). Distribution: Caribbean wide. Depth: 15-100ft. Characteristics: Encrusting with round to oval shaped papillae (2-5 mm wide, 1-2 mm high) excavates several cm (up to 10 cm) into the coral rubble. Orange reddish in color. Surface smooth, and velvety on papillae. Oscules with volcano-shaped membranes (1-3 cm in diameter, and 0.5 1 cm high).