It is endemic to the Mediterranean Sea, where it forms encrusting colonies on rocks and other hard surfaces.

Oscarella tuberculata is a thickly encrusting sponge forming small patches up to 20 cm (8 in) in diameter.

The surface is granular or wrinkled, with Irregular lobes and bulges, and small tubular structures emerging, some bearing osculae.

[2] Oscarella tuberculata occurs in the Mediterranean Sea at depths of between about 5 and 25 m (16 and 82 ft), on rocky substrates.

The "bubble" is buoyant in the water column for a few days before settling on the seabed and attaching to the substrate, assisted by small conical outgrowths.