Phylogeny
Morphological characters and mitochondrial cytochrome b DNA sequences showed that ''P. decumanus'' represents one independent evolutionary lineage within the genus ''Proechimys'', without clear phylogenetic affinity for any of the 6 major groups of species.References
Proechimys Mammals described in 1899 Taxa named by Oldfield Thomas Taxonomy articles created by Polbot {{Echimyidae-stub