Taxonomic implications from phylogenetic relationships of subspecies of Schizopygopsis malacanthus (Pisces : Cyprinidae) based on sequence analysis of cytochrome b and mitochondrial DNA control region

摘要

Phylogenetic relationships of three subspecies of Schizopygopsis malacanthus, S. m. malacanthus, S. m. chengi, and S. m. baoxingensis, were investigated based on the mitochondrial DNA control region and the cytochrome b gene. Phylogenetic analysis indicated that the three subspecies did not cluster as one monophyletic group; S. m. malacanthus clustered into one clade, while S. m. chengi and S. m. baoxingensis clustered into another. Genetic distances between S. m. malacanthus and the other two subspecies were either very close to or larger than those between S. m. malacanthus and some other species of Schizopygopsis. There was very small genetic distance between S. m. chengi and S. m. baoxingensis. The results suggested S. m. chengi should be split from S. malacanthus into a separate species, Schizopygopsis chengi (Fang); S. m. baoxingensis should be regarded as a subspecies, S. c. baoxingensis (Fu, Ding et Ye), of Schizopygopsis chengi.