Fig. 1

Schematic phylogenetic relationships between species used in this study. Species or groups of species shown in black at the end of branches are the 61 species included in Ensembl release 69, and were used to reconstruct the ancestral Amniota genome. Sauropsids include birds and reptiles. Species shown in grey were used at other stages in the analysis. Black circles materialize ancestral genomes relevant to this study. Red crosses indicate the relative positions of WGDs: two before the vertebrate radiation and one before the teleost fish radiation. Branches are not to scale