Whole-genome duplication events across metazoan phylogeny. Xiphosuran, chelicerate
and metazoan consensus phylogeny, with arthropod relationships based on Regier et al. (2010) and wider metazoan
relationships based on Dunn et al. (2008).
Note that some inter-relationships, notably in the Chelicerata, are controversial.
Specific clades noted in the text, such as the Chelicerata, Protostomia and
Deuterostomia, are indicated by differential shading. Known WGD events are marked
with a lightning bolt. Note multiple rounds of WGD have occurred in all lineages
thus marked.