Fig. 1.

Schematic phylogenetic tree of fishes. Taxonomy as in Helfman et al. (2010). The blue arrow indicates the whole genome duplication (WGD) which occurred during the early evolution of ray-finned fishes and led to a tetraploidization followed by a rediploidization. Red arrows indicate examples of posterior WGD in specific branches. The green dot denotes an example of genome contraction in tetraodontiformes. A genome sequence is available for all species in blue