Rao, unaware that the holotype was still in existence, deposited a neotype in the Natural History Museum in London, but this specimen has since disappeared.

[2] Agelas dispar forms massive irregularly-shaped, sometimes bulbous mounds or may be encrusting.

The consistency is spongy but firm; the surface is smooth with many exhalent pores of irregular shape and size, often in shallow pits.

There is a fibrous, tightly-meshed skeleton made of spongin with ascending and tangential fibres.

[2][3][4] Agelas dispar is found in the Caribbean Sea and around the West Indies; its preferred habitat is shallow-water reefs.