HESS, Hans; MESSING, Charles G. Part T, Echinodermata 2 (Revised), vol. 3, ch. 2, p. 70–159. Treatise on Invertebrate Paleontology, [S. l.], 2011. DOI: 10.17161/dt.v0i0.5392. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5392.. Acesso em: 4 may. 2024.