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Chromosomes of Hynobius chinensis Günther and Hynobius amjiensis Gu from China, and Comparison with Those of 19 Other Hynobius Species

Abstract We report for the first time the chromosome numbers, karyotypes and C-banding patterns of Hynobius chinensis and Hynobius amjiensis from the middle-eastern region of mainland China. Both species had a diploid set of 56 chromosomes, with similar karyotypes. Among Hynobius species, the C-banding patterns of H. chinensis and H. amjiensis were the most similar to those of H. leechii from the northern region of South Korea. The chromosome number of H. chinensis and H. amjiensis was identical to that of 11 Hynobius species distributed throughout Korea and Japan. This identity indicates close phylogenetic relationships among the 13 species.