Callyspongia crassa, commonly known as prickly tube-sponge, is a species of sponge found from the Red Sea to the Seychelles.

[4] They also play an important role in marine reef and benthic communities, as they constantly filter water and act as habitats for smaller organisms.

[7] The name crassa derives from the Latin word crassus meaning solid, thick, fat, or dense.

[8] Its common name, the prickly tube-sponge, comes from its physical appearance as it is a tube sponge and it is nearly completely covered in spines.

Most of its surface is covered with spines or spine-like protrusions which tend to taper away towards the upper part of the tube.

[4] Many species of sponge are used for marine drugs due to their bioactive components, many of which are used for antiseptic agents.

[2] They filter feed because they lack true tissues and organs, so they can not have a digestive system similar to other animals.