Debrenne, F., et al. “Treatise Online no.56: Part E, Revised, Volume 4, Chapter 20C: Archaeocyatha and Cribricyatha Nomina Nuda; Taxa Not Archaeocyatha, Radiocyatha, or Cribricyatha”. Treatise Online, Feb. 2012, https://doi.org/10.17161/to.v0i0.4429.