Fig. 2

Protein families of the Arthropods complete proteomes by species-specific assignment. Each of the 18 analyzed organisms is associated with the listed number of protein families (as in Fig. 1a) along the accepted phylogenetic tree. D. pulex serves as an outgroup. Numbers on the nodes of the phylogenetic tree are the estimated branch length of speciation (in million years). Branch lengths are extracted from [40], TimeTree [57] (italic) and inference (numbers in parenthesis). The sources for all 18 complete proteomes and the number of families according to PL70 partition are summarized in an Additional file 1: Table S1