Abstract
The complete mitochondrial genome of Pseudochauhanea macrorchis was determined and compared with other monogenean mitochondrial genomes from GenBank. The circular genome was 15,031 bp in length and encoded 36 genes (12 protein-coding genes, two ribosomal RNAs, and 22 transfer RNAs) typically found in flatworms. Structures of the mitochondrial genome were mostly concordant with that known for Microcotyle sebastis and Polylabris halichoeres, but also contained two noted features-a gene rearrangement hot spot and the highly repetitive region (HRR) in major non-coding region (NCR). The gene rearrangement hot spot located between the cox3 and nad5 genes, including a cluster of tRNA genes, nad6 gene and one major NCR. The HRR seemed to be a unique feature of the polyopisthocotylean mitochondrial genomes. In conclusion, the present study provided new molecular data for future studies of the comparative mitochondrial genomics and also served as a resource of markers for the studies of species populations and monogenean phylogenetics.
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