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Star encrusting sponge
Halisarca caerulea

Flat incrustations, several mm in thickness and several square cm in lateral expansion, with very characteristic star-shaped oscules and canal system. These star-shaped systems are isolated from each other by a cm at least of flat featureless surface (H. caerulea-close up). Slimy-smooth when touched. The consistency is toughish, not very compressible.

Light purple.

Encrust dead areas of reefs and walls.

Occasional Florida, Bahamas and Caribbean.

Star encrusting sponge (Halisarca caerulea)