KIER, P. M.; DURHAM, J. Wyatt; WAGNER, Carol D.; FISCHER, A. G. Part U, Echinodermata 3, vol. 1 & 2, ch. 5, p.492-670. Treatise on Invertebrate Paleontology, [S. l.], 1966. DOI: 10.17161/dt.v0i0.5657. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5657.. Acesso em: 27 apr. 2024.