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- Iniesta, L.F.M.; Ferreira, R.L. 2013: Two new species of Pseudonannolene Silvestri, 1895 from Brazilian limestone caves (Spirostreptida: Pseudonannolenidae): synotopy of a troglophilic and a troglobiotic species. Zootaxa 3702(4): 357–369. DOI: 10.11646/zootaxa.3702.4.3