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(van Beneden, 1841)

Hydractiniidae with 4 or more solid, simple, marginal tentacles, not in groups; usually 4 or 8 simple or slightly branched mouth arms (which are dilations of the mouth rim) armed with clusters of cnidocysts; with or without gastric peduncle; gonads on manubrium, interradial, but sometimes extending along proximal parts of radial canals; with or without ocelli; sometimes asexual reproduction by medusa budding on manubrium.

Hydractinia tenuis
Hydractinia tournieri
Hydractinia minima
Hydractinia minuta

Genus Hydractinia