Alvarez, Fernando, J. L. Carter, D. E. Lee, Rémy Gourvennec, N. M. Savage, D. I. MacKinnon, and P. G. Baker. “Part H, Brachiopoda (Revised), Vol. 6, Ch. 7, P. 2742–2821”. Treatise on Invertebrate Paleontology (January 1, 2007). Accessed August 17, 2025. https://journals.ku.edu/InvertebratePaleo/article/view/5521.