Fig. 2

Evolutionary dynamics of gene families in ticks. A Distribution of gene families in ticks and other Chelicerata. The top bar plot represents the number of families shared in a given intersection; the left bar plot gives the number of families per species. Species were ordered according to their phylogeny (right tree), and intersections with a phylogenetic relevance are indicated in orange. Tick (Ixodida) species are highlighted in green. B Phylogenetic tree of Chelicerata, based on complete genomes. The tree was built by IQ-TREE 2 using a concatenation of 107 single-copy protein sequences, shared by all represented species. Branch support is shown by bootstrap values and Shimodaira-Hasegawa approximate likelihood ratio test (SH-aLRT) values. C Gene expansion and contraction dynamics in Chelicerata, analyzed with CAFE. The expansion rate per node is given by the size and the color of the points. The number of expanding ( +) or contracting ( −) gene families for each node is in blue and above the branches. The number of new families per node is in green. The tree was built by IQ-TREE 2 using 107 protein sequences, before being transformed into an ultrametric tree using phytools and ape R packages