Fig. 1. An evolutionary transformation: paired fin position throughout fish evolution. A representative cladogram of selected fish groups. In the basal condition, paired pectoral fins (red) are ventrally located and paired pelvic fins (green) are located behind the centre of mass. In the derived condition, pectoral fins are located laterally on the body and the pelvic fins are located directly below or even in front of the centre of mass. Black and white circles represent the estimated location of fish centre of mass.