Figure 2
From: Two sisters in the same dress: Heliconius cryptic species
Histogram of phenotypic measurements of the ventral red line. The measurements taken from 131 forewings clearly show a bimodal distribution. The short line individuals represent the H. cydno cognate and the long line individuals H. m. malleti, respectively. In dark gray are the five individuals with intermediate population assignment probabilities determined from microsatellite data.