Caulospongia amplexa is a species of sea sponge belonging to the family Suberitidae.

[1][2] Caulospongia amplexa sponges have even lobes (0.2-0.3 cm thick) which consist of a single whorl around the central hollow stem.

The lobes slope downwards at the outer edge.

The lobes are widest in the central part of the sponge, narrowing towards both the base and the apex.

Colours of the type specimens varied from salmon to orange pink, yellow and yellowish-brown.