The central region of Brazil has been a wellspring of terrestrial mollusk biodiversity. One possible reason is that the region has a larger amount of limestone, relatively scanty in Brazilian territory (Ker 1997). Several new taxa from that region have been recently described, including new species and new genera (e.g., Simone 2012a, b, 2013). The region also is rich in caves, which are sometimes inhabited by endemic troglobian or troglophile species.