Iniesta, L.F.M. and 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 (Aug. 2013), 357–369. DOI:https://doi.org/10.11646/zootaxa.3702.4.3.