FELL, H. B.; DURHAM, J. Wyatt; PAWSON, D. L. Part U, Echinodermata 3, vol. 1 & 2, ch. 4, p. 367-491. Treatise on Invertebrate Paleontology, [S. l.], 1966. DOI: 10.17161/dt.v0i0.5656. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5656. Acesso em: 11 dec. 2024.