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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

Family Bougainvilliidae