Salvador, Rodrigo BrincalepeSilva, FernandaBichuette, Maria Elina2023-08-292023-08-292022-09-1410.3897/zse.98.90797https://bdc.icmbio.gov.br/handle/cecav/1776Idiopyrgus is a relict genus of freshwater snails from Brazil traditionally classified in the family Pomatiopsidae. Herein, we use mo lecular 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 inBahia state are described herein: Idiopyrgus adaman teus sp. nov. and Idiopyrgus minor sp. nov.enCaenogastropodaGondwanaMolecular phylogeneticsPomatiopsidaeTomichiidaeArtigo