Body shape variation between thin-lipped and thick-lipped Apoyeque Midas cichlids. (a) The location of 13 landmarks to describe body shape. (b) Body shape differs significantly between thin- and thick-lipped fishes (P = 0.001). Here this is visualized (scale factor 4) as landmarks compared between the mean thick-lipped (circle; n = 36) and mean thin-lipped (arrow; n = 135) fishes. Body shapes remain different if the two landmarks describing lip thickness are excluded (P = 0.033) Body length does not differ between morphs (P = 0.34; see text for details).
Elmer et al. BMC Biology 2010 8:60 doi:10.1186/1741-7007-8-60