The nucleotide sequences of two mitochondrial genes (cytochrome c oxidase subunit I, COI, and cytochrome b, cyt b) and four nuclear genes (growth hormone gene GH1, ribosomal protein S7 gene RP1, recombination activating gene RAG1, and rhodopsin gene RH) from the Far Eastern redfins of the genus Tribolodon were examined to clarify the status of the southern form of T. hakonensis. Nucleotide sequence analysis of the mitochondrial genes showed differences of 2.6% between individuals of T. hakonensis inhabiting the north and south of the range. Analysis of the nuclear genes showed that Tribolodon sp. (southern form of T. hakonensis) has a mosaic of nuclear genes received from the Pacific redfin T. brandtii and big-scaled redfin T. hakonensis. It is suggested that the new species could have formed as a result of homoploid hybridization between the true T. hakonensis (by original description) and T. brandtii, which probably made it possible for this species to occupy a new ecological niche.
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