Iniesta, L.F.M. & Ferreira, R.L. (2013)

Two new species of Pseudonannolene Silvestri, 1895 from razilian limestone caves (Spirostreptida: seudonannolenidae): synotopy of a troglophilic and a troglobiotic species

. Zootaxa, 3702 (4), 357–369.