Figure 1
From: Conserved syntenic clusters of protein coding genes are missing in birds
Schematic depicting the phylogenetic relationships among major Amniote lineages. Geological eras indicated at the top. Genes that are shared by all organisms shown, but missing in Birds (in red) are presumed to have been lost in non-crocodilian archosaur (possibly Saurischian) ancestors of birds. Names to the right of the silhouettes indicate the extant species analyzed in this study; dashed lines indicate extinct lineages.