L. F. M. Iniesta and R. L. Ferreira, “New species of Pseudonannolene Silvestri, 1895 from Brazilian limestone caves with comments on the potential distribution of the genus in South America (Spirostreptida: Pseudonannolenidae)”, Zootaxa, vol. 3846, no. 3, pp. 361–397, Aug. 2014.