; class Crinoidea, subclass Articulata)
An order of sea lilies which possess a stout calyx consisting of basals and radials only (i.e. which is monocyclic). The long column is cylindrical in section and is distally attached to the substrate by a root-like structure or disc. The order is known from the Middle Triassic to the present.
Subjects: Zoology and Animal Sciences.