A. Scatter plot of 1st and 3rd principal components for Sinocyclocheilus guiyang, S. punctatus, S. multipunctatus and S. sanxiaensis; B. Scatter plot of 1st and 2nd principal components for S. guiyang and S. punctatus; relationships between C. Rostral barbel length and head length, D. Maxillary barbel length and head length for S. guiyang, S. punctatus and S. multipunctatus; relationships between E. Prenostril length and head length, F. Caudal peduncle depth and caudal peduncle length for S. guiyang and S. punctatus.