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Metaphire remanens sp. nov. is widely distributed throughout Hunan Province, China. We sequenced the mitochondrial DNA to investigate its population genetic structure and genetic diversity, including cytochrome c oxidase subunit I, cytochrome c oxidase subunit II, 12S ribosomal (r)RNA, 16S rRNA, and nicotinamide adenine dinucleotide dehydrogenase subunit 1, derived from 39 individuals from seven geographic locations in Hunan Province. The genetic diversity indices showed that populations of M. remanens have a strong genetic structure and obvious dispersal histories. M. remanens did not experience population expansion, except in Xiangtan City. This may be because of its evolution toward parthenogenesis. The divergence time estimates indicated that M. remanens originated at 19.2055 Ma and then generated two main lineages at 1.7334 Ma (Quaternary glaciation). These results indicate that glaciation, geographic isolation, and dispersal ability are significant factors that influence the differentiation and dispersal of M. remanens. In this study, we describe Metaphire remanens sp. nov. in morphology.

diversity

Population Genetic Structure and Diversity of Metaphire remanens (Oligochaeta: Megascolecidae) Based on Mitochondrial DNA Analysis, with a Note on a New Species of Metaphire remanens sp. nov.