Characterization of the complete maternal mitochondrial genome of Ptychorhynchus pfisteri (Bivalvia: Unionidae: Gonideinae).

The freshwater mussel Ptychorhynchus pfisteri is a threatened and endemic species in China. In this study, the complete maternal mitochondrial genome of P. pfisteri was firstly determined (GenBank accession no. KY067440). The circle genome is 16,040 bp in length. It consists of 14 protein-coding genes ( cox1-3, nad1-6, nad4L, cob, atp6, atp8 and FORF), 22 tRNA genes, two rRNA genes and a putative control region. The gene order of P. pfisteri is not identical to other unionoid bivalves except Gonideinae species. Maximum likelihood analyses reveal that P. pfisteri belongs to the subfamily Gonideinae. [ABSTRACT FROM AUTHOR]