Scatter plot of Principal Component Analysis (PCA) of six allopatric populations of H. acuen (n = 83) indicating the presence of continuous external morphology variation. Purple circle = affluent of rio Toguro; Red cross = affluent of rio Culuene; Dark blue star = affluent of rio Suiá-Missu; Blue square = affluent of rio Feio; Yellow triangle = córrego Xavante; Green diamonds = rio Coronel Vanick. All are tributaries of rio Xingu, Mato Grosso State in Brazil.

 
 
  Part of: da Costa e Silva G, Roxo F, Oliveira C (2014) Hisonotus acuen, a new and phenotypically variable cascudinho (Siluriformes, Loricariidae, Hypoptopomatinae) from the upper rio Xingu basin, Brazil. ZooKeys 442: 105-125. https://doi.org/10.3897/zookeys.442.7870