Calyptorete Okada, 1925

Revised generic diagnosis (emended from Reiswig & Wheeler, 2002): The body is cup-shaped and composed of branching and radiating tubes supported on a tubular stalk. The tubes originate from the basal stalk and are arranged radially around a central atrial or pseudoatrial cavity. They have lateral oscula opening on the external surfaces of the cup. These oscula are covered by sieve plates from a layer of fused hexactins similar to those in the dermis. The skeletal framework is euretoid, not channelized. Dermalia are hexactins with a rudimentary distal ray, atrialia likely absent. The uncinate complement varies within species, strongyloscopules always present, tyloscopules may be absent, microscleres with discoidal outer ends are discohexasters and sometimes discohexactins.