Methods follow Armbruster (2003) with the addition of counts of mid-dorsal and
mid-ventral plates (the number of plates in these series from the head to caudal fin
and excluding the last plate, which is beyond the hypural). Institutional abbreviations
are as in Sabaj Pérez (2014). Names of skeletal characteristics are as in Schaefer (1987)
and of plate rows as in Schaefer (1997). A principal component analysis for the
morphometric data of all Peckoltia examined in Armbruster (2008) and the specimens
below was performed using a covariate matrix and log-transformed measurements
in JMP (Vers. 5.01a, SAS Institute, 2002). We have not examined specimens of
recently described species (P. capitulata, P. compta, P. otali, and P. stimulata). Principal
component one was excluded from further analysis because it represented overall size
differences (vs. relative size differences). The following abbreviations are used in the