Eudendrium Ehrenberg, 1834

Diagnosis. Colony with erect, usually branched stems arising from a creeping hydrorhiza. Hydrocaulus enclosed in a firm perisarc extending to hydranth base; hydranth large with a pedunculated hypostome and one whorl of filiform tentacles; gonophores fixed sporosacs borne on hydranth body below tentacles, male gonophores usually with several chambers, female with a single egg.