Here we describe the new species Pseudoporatia kananciue Iniesta, Bouzan, Souza & Brescovit, n. sp., widespread in the Amazonian ferruginous landscape of the state of Pará, Brazil. The species differs from its only congener P. perplexa Golovatch, 1999 by the presence of 19 body rings in adults (vs 20 body rings), the position of the porosteles on the paraterga, and the morphology of the gonopods. Notes on its ecology and comments on the diversity of millipedes in the region of Serra dos Carajás, state of Pará, Brazil, are also provided.