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Idiopyrgus    is a relict genus of freshwater snails from Brazil traditionally classified in the family   Pomatiopsidae  . Herein, we use molecular data from newly acquired specimens to test that classification through Bayesian inference phylogenetic analysis. We conclude that    Idiopyrgus    belongs in the Gondwanan family   Tomichiidae  , together with the African genus    Tomichia    and the Australian genus    Coxiella   . Furthermore, we reassess currently synonymized genus- and species-level names in    Idiopyrgus   . The genera    Hydracme    and    Aquidauania    are considered synonymous with    Idiopyrgus   . The species    I.   brasiliensis    and    I.   pilsbryi    are restored as accepted species;    I.   walkeri    is considered a taxon inquirendum. Two new species from caves in Bahia state are described herein:    Idiopyrgus   adamanteus    sp. nov.  and    Idiopyrgus   minor    sp. nov.

zoosystematics and evolution

Phylogenetic position of the relict South American genus    Idiopyrgus    Pilsbry, 1911 (  Gastropoda  ,   Truncatelloidea  ), with the description of two new cave species