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Bevilaqua, M. and Fonseca, C.R.V. da 2020. Two new species of Passalus Fabricius (Coleoptera: Passalidae) from the western Brazilian Amazon with comments on the taxonomic limits of the subgenera. Papéis Avulsos de Zoologia. 60, special (Mar. 2020), e202060(s.i.).19. DOI:https://doi.org/10.11606/1807-0205/2020.60.special-issue.19.