This 5-rayed seastar has a thick, broad central disk and rays approximately as long as the central disk is wide. It has no conspicuous marginal plates; in fact, the entire aboral surface is covered with a thick, loose, elevated fleshy membrane, giving it a fairly smooth texture and soft feel. The madreporite cannot be seen--instead, a central pore opens into the spongy space between the membrane and the aboral surface. When disturbed, often secretes large amounts of a thick, viscous slime. Color yellowish brown or pale orange. Diameter about 15 cm.