Webby, Barry D., and Colin W. Stearn. “Part E, Porifera (Revised), Vol. 4 & 5, Ch. 9, P. 575–630”. Treatise on Invertebrate Paleontology (January 1, 2015). Accessed May 2, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5760.