Scheffler, Sandro Marcelo, et al. “Crinoidea from Eastern Border of the Parnaíba Basin (Cabeças Formation, Middle Devonian)”. Boletim Do Museu Paraense Emílio Goeldi - Ciências Naturais, vol. 5, no. 2, Aug. 2010, pp. 165-73, https://doi.org/10.46357/bcnaturais.v5i2.640.