Ectyonopsis pluridentata, the fused branch sponge, is a species of demosponge from South Africa.

The fused branch sponge is made up of a thick cluster of fused branches arising from an indistinct base.

The surface is rough and is covered in small (<1 mm (0.039 in)) circular ostia.

[3] This species is endemic to South Africa.

It is found on the South and West coasts of the country, where it lives at depths of 79–201 m (259–659 ft).