Fig. 2: Comparative synteny analysis using chromosome-level assemblies of androdioecious Pristionchus nematodes.

Circos plot of comparative synteny between the basal species, P. fissidentatus and P. pacificus (a); P. exspectatus (b); P. mayeri (c) and P. entomophagus (d), respectively. For each species pair, three thousand pairs of one-to-one orthologous genes were randomly selected, and their genomic positions were displayed as links. Dot plot of comparative synteny between P. fissidentatus and P. pacificus (e); P. exspectatus (f); P. mayeri (g) and P. entomophagus (h), respectively, for the chromosomes involved in chromosome fusions. Red heat panels in the axes indicate trends of gene density (i.e. LOESS regression curves) as shown in Supplementary Fig. 7. Fusion patterns are represented by coloured bars similar to Fig. 1. The species phylogeny is displayed on the right.