MELVILLE, R. V.; FELL, H. B.; KIER, P. M.; DURHAM, J. Wyatt; WAGNER, Carol D.; PAWSON, D. L.; FISCHER, A. G. Part U, Echinodermata 3, vol. 1 & 2, ch. 3, p. 211-366. Treatise on Invertebrate Paleontology, [S. l.], 1966. DOI: 10.17161/dt.v0i0.5655. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5655. Acesso em: 4 dec. 2024.