Characterization and Comparison of the Two Mitochondrial Genomes in the Genus .

The mitochondrial genome (mitogenome) possesses several invaluable attributes, including limited recombination, maternal inheritance, a fast evolutionary rate, compact size, and relatively conserved gene arrangement, all of which make it particularly useful for applications in phylogenetic reconstruction, population genetics, and evolutionary research. In this study, we aimed to determine the complete mitogenomes of two morphologically similar species ( and ) using next-generation sequencing. The entire circular mitogenome was successfully identified, with a length of 19,395 bp for and 17,833 bp for . The mitogenomes of both species contained 37 genes, including 13 protein-coding genes (PCGs), two ribosomal RNA genes, 22 transfer RNA genes, and one control region; mitogenome size varied predominantly with the length of the control region. The two synonymous codon usages in 13 PCGs showed that T and A were used more frequently than G and C. The ratios of non-synonymous to synonymous substitutions of all 13 PCGs were <1 in the species, indicating that the PCGs were under purifying selection. Finally, phylogenetic relationship analyses suggested that and were classified in the group. Our study provides valuable reference material for the taxonomy of the genus .