Eudendrium
Diagnostic description:
Hydrocaulus invested with perisarc. Hydranths radially symmetrical with large hypostome and a whorl of filiform tentacles. Microbasic euryteles always present in tentacles; other kinds of nematocysts may be present in hydranth and gonophores. Gonophores, fixed sporosacs, borne on hydranth below tentacles. Reproductive hydranth often reduced to a blastostyle. Male gonophores single or in linear series. Young female gonophore a single egg encircled by a spadix.