VirgulariidaeVirgulariidae is a family of sea pens, a member of the subclass Octocorallia in the phylum Cnidaria.CharacteristicsColonies are bilateral, long and slender to very slender. The colony axis is noticeable and present throughout.GeneraThe World Register of Marine Species lists the following genera:Acanthoptilum Kölliker, 1870Grasshoffia Williams, 2015Scytaliopsis Gravier, 1906Scytalium Herklots, 1858Stylatula Verrill, 1864Virgularia Lamarck, 1816