ABSTRACTCurrently Neotroponiscus comprises eight species. In this study, two new species of this genus of terrestrial isopods are described. Neotroponiscus iporangaensis sp. nov. was collected in limestone caves located in Parque Estadual Turístico do Alto Ribeira (PETAR). Neotroponiscus tuberculatus sp. nov. occurs in iron ore caves of the Iron Quadrangle (local name Quadrilátero Ferrífero) and represents the first species of the genus recorded in iron caves. As tourism and mining are common activities in PETAR and in the caves of the Iron Quadrangle, respectively, both species’ occurrence is threatened.http://zoobank.org:pub:45DFEEEC-0590-49E2-8A53-E48F081FB497