context source (Hexacorallia)Fautin, Daphne G. (2013). Hexacorallians of the World. (look up in IMIS) [details]
basis of recordHuxley, Th.H., 1859. The oceanic Hydrozoa; a description of the Calycophoridae and Physophoridae observed during the voyage of H.M.S. "Rattlesnake", in the years 1846-50., available online athttps://www.biodiversitylibrary.org/page/10599749[details]
redescriptionPugh, P. R.; Baxter, E. J. (2014). A review of the physonect siphonophore genera <em>Halistemma</em> (Family Agalmatidae) and <em>Stephanomia</em> (Family Stephanomiidae). <em>Zootaxa.</em> 3897(1): 1., available online athttp://www.mapress.com/zootaxa/2014/f/z03897p111f.pdf note: status, taxonomic history, synonymy [details]