Dataset for Molecular systematics and biogeography of a new rheophilic species of ghost electric fish (Porotergus: Apteronotidae: Gymnotiformes) from the eastern Guianas

We report mitochondrial and nuclear DNA sequences from Porotergus maroon, a newly described rheophilic species of ghost electric fish (Gymnotiformes: Apteronotidae) from the eastern Guianas in Systematics and Biodiversity, and from Porotergus duende for comparative purposes. Partial mitochondrial fragments of cytochrome b (1051 bp) and 16S rRNA (525–527 bp), as well as a nuclear fragment of the recombination activating gene 2 (rag2, 1192 bp), were obtained from voucher specimens housed in the Museu de Zoologia da Universidade de São Paulo (MZUSP 131371) and the Muséum d’Histoire Naturelle de Genève (MHNG 2780.037). Sequences were generated by Sanger dideoxy sequencing and assembled in Geneious Prime v2025.2. The new mitochondrial and nuclear data contribute to an ongoing phylogenetic and biogeographic study of Porotergus, clarifying lineage boundaries and evolutionary relationships within the genus across the eastern Guianas. GenBank accession numbers will be available as soon as the current government shutdown is over.