The Monterrey platyfish (Xiphophorus couchianus) is native to the vicinity of Monterrey, Mexico and is listed as Critically Endangered by International Union for Conservation of Nature (IUCN). Here, we describe the complete mitochondrial genome (mitogenome) sequence of Monterrey platyfish. The genome is 16 638 bp in length, consisting of 13 protein-coding genes, 22 transfer RNA (tRNA) genes, 2 ribosomal RNA genes and 1 non-coding control region. Phylogenetic tree was constructed based on the complete mitogenome of X. couchianus and closely related five Poeciliid species to estimate their phylogenic relationship. The complete mitochondrial genome of X. couchianus would provide more valuable information to assess the evolution of family Poeciliidae.
Keywords: Mitochondrial genome; Monterrey platyfish (Xiphophorus couchianus); Poeciliidae.