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The upper surface, or tegmen, is divided into five ambulacral areas, including a deep groove from which the tube feet project, and five interambulacral areas between them.

The anus, unusually for echinoderms, is found on the same surface as the mouth, at the edge of the tegmen.

The intestine often includes numerous diverticulae, some of which may be long or branched.

The end of the intestine opens into a short muscular rectum.

This ascends towards the anus, which projects from a small conical protuberance at the edge of the tegmen.

The tube feet are covered with a sticky mucus that traps any food that floats past.

The aboral surface of the body is studded with plates of calcium carbonate, forming an endoskeleton similar to that in starfish and sea urchins.

These make the calyx somewhat cup-shaped, and there are few, if any, ossicles in the oral (upper) surface.

In most living species, especially the free-swimming feather stars, the arms branch several times, producing up to two hundred branches in total.

The arms are jointed, and lined by smaller feather-like appendages, or pinnules, which also include tube feet.