divepix - Black Ball Sponge

Black Ball Sponge

Aspect:	Generally a hard (not "spongy") dark grey or black ball with irregular outer surface and openings at its top (excurrents), an overall shaped that is somewhat reminiscent of a large wasp's nest.
Population:	Common.
Notable feature:	Outer surface can be as rough as a pinaple, and colour, as testified by specimens photograhed below, may also be dark red or brown.
Environment:	Shallow waters, attaches to a variety of structures.
Behaviour:	-