Principal Component Analysis of species of Peckoltia with Peckoltias.s. being those Peckoltia with jaws forming an angle less than 90° (some P. furcata also have this low jaw angle). PC2 is most strongly influenced negatively by barbel length, internares with, and caudal-peduncle depth, and positively by dentary length, premaxillary length, and mouth width. PC3 is most strongly influenced negatively by barbel length, premaxillary length, and dorsal-adipose distance, and positively by adipose-upper caudal distance, adipose spine length, and head-dorsal distance.