Bevilaqua, Marcus, and Claudio Ruy Vasconcelos da Fonseca. “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, no. special (March 4, 2020): e202060(s.i.).19. Accessed September 28, 2021. https://www.revistas.usp.br/paz/article/view/163632.