Hydranthea Hincks, 1868

Colony stolonal, hydrotheca short, collar-shaped on short pedicel, hydranth large, elongate, with intertentacular web with heterotrichous haploneme nematocysts; gonotheca reduced or absent, gonophores on hydrorhiza, eumedusoid, short-lived, without marginal tentacles, “gonads” on radial canals.