Mitochondrial genomes of the South American electric knifefishes <i>Eigenmannia humboldtii</i> (Steindachner 1878), <i>Eigenmannia limbata</i> (Schreiner and Miranda Ribeiro 1903), <i>Sternopygus aequilabiatus</i> (Humboldt 1805) and <i>Sternopygus macrurus</i> (Bloch and Schneider 1801), (Gymnotiformes, Sternopygidae)

We report four mitochondrial genomes of South American electric knifefishes, derived from target capture and Illumina sequencing (HiSeq 2500 PE100). Two trans-Andean species <i>Eigenmannia humboldtii</i> (mitochondrial consensus genome of 25 individuals) and <i>Sternopygus aequilabiatus</i> (mitochondrial consensus genome of 30 individuals) from Colombia and two cis-Andean species <i>Eigenmannia limbata</i> from Suriname and <i>Sternopygus macrurus</i> from Argentina. Regarding <i>Eigenmannia humboldtii</i>, <i>Eigenmannia limbata,</i> and <i>Sternopygus macrurus</i> mitochondrial genomes have 13 protein-coding genes, 1 D-loop, 2 ribosomal RNAs, 22 transfer RNAs, and are 13,394 bp, 10,921 bp, and 13,013 bp in length respectively, for <i>Sternopygus aequilabiatus</i> mitochondrial genomes have 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs, and is 14,270 bp in length.