Illumination of species diversity and their distribution is key to
evolution, genetics and conservation. The genus of Sibynophis is a group
of rare snakes with less attentions. Based on more extensive sampling,
we use both mitochondrial fragments and nuclear gene to explore the
species diversity of the species of Sibynophis occurring in China. The
results showed that S. c. miyiensis is a synonym of S. c. grahami, and
S. c. grahami should be gave a specific rank as S. graham. Sibynophis
triangularis was uncovered to be new to China and Myanmar. On basis of
our specimens and molecular phylogeny results, the species distribution
boundaries of each Chinese species were redefined.