The red encrusting sponge (Clathria oudekraalensis) is a species of sea sponge. It is known only from the South African coast, on both sides of the Cape Peninsula. It is endemic to this region.
The red encrusting sponge grows to about 1 cm in thickness and up to 30 cm wide. It is a bright red encrusting sponge. Its surface is smooth and the oscula are not visible.
