Lütken, 1850
Usually bell-shaped; with short manubrium; with simple circular mouth; oral tentacles simple or dichotomously branched, inserted distinctly above mouth rim and armed with cnidocyst clusters; with 4 radial canals and circular canal; with solid marginal tentacles either solitary or in clusters, borne on 4, 8, or 16 tentacle bulbs; with gonads on manubrium either forming a continuous ring, or on adradial, interradial, or perradial axes; with or without adaxial ocelli.
Genus Bougainvillia
Genus Koellikerina
Genus Thamnostoma