MACURDA, JR., D. B. et al. Part T, Echinodermata 2, vol. 1-3, ch. 2, p. 217 - 316. Treatise on Invertebrate Paleontology, [S. l.], 1978. DOI: 10.17161/dt.v0i0.5643. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5643. Acesso em: 30 mar. 2025.