Hyocrinidae

Hyocrinidae is a family of echinoderms, the only family in the order Hyocrinida.

==Characteristics== Members of this order have long slender stems consisting of a large number of identical columnar units. There are no cirri, and the basal disc of the stem attaches directly to the substrate. The calyx is globular or conical, and consists of five widely-spaced, undivided arms attached to five radial ossicles.