Graphic representation of the first three principal components of morphology.

<p>PCA analysis included Ln(SL) and 9 size-corrected morphological variables for 55 species in 21 genera of South American cichlids, including 15 of 17 geophagine genera (missing genera are <i>Teleocichla</i> and <i>Crenicara</i>). Genera are labeled by color as per the inset legend. Polygons represent the total morphospace for each genus, with small points depicting each individual score and large points their centroid. Scores for morphological variables increase in the direction of the arrows. (See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033997#pone.0033997.s003" target="_blank">Table S3</a> for species list, sample sizes, morphological eigenvector values and score values for each individual fish).