Literature

• Soest, R.W.M. van, Beglinger, E.J. & Voogd, N.J. de 2010. Skeletons in confusion: a review of astrophorid sponges with (dicho-)calthrops as structural megascleres (Porifera, Demospongiae, Astrophorida). ZooKeys 68: 1-88.
• WoRMS. World Register of Marine Species. www.marinespecies.org. [link]

Literature references linked to higher taxa

• Voss, G.L. 1976. Seashore Life of Florida and the Caribbean. 167. E.A. Seemann Publishing, Inc.. (Porifera)