5. Conclusions
Our study used combined characteristics from morphological analysis and multilocus approaches to show that the Naumann’s and dusky thrush complexes and the red-throated and black-throated thrush complexes in the Turdidae family should be divided into two separate species (T. naumanni and T. ruficollis ) and two subspecies. Importantly, we validated extensive nuclear introgression betweenT. naumanni and T. ruficollis for the first time. We also provided a potential explanation of the mechanism of gene introgression and nuclear-mitochondrial discordance between the two birds. However, a more-comprehensive collection of specimens of these birds in their breeding range is needed to clarify the relationship between gene introgression and speciation in these birds.