All three species of Ptychodactiaria belong to order Actiniaria (Cnidaria: Anthozoa)
Cappola, V.A.; Fautin, D.G. (2000). All three species of Ptychodactiaria belong to order Actiniaria (Cnidaria: Anthozoa). J. Mar. Biol. Ass. U.K. 80(6): 995-1005
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769, more