Figure 4.

Expansion of the XY-LG5/19 sex chromosome on the phylogeny of Clade 2 as estimated from sex-specific SNP density data. Circles indicate expansion of LG5, stars indicate expansion of LG19. For LG5 the dotted pattern indicates what is presumably the original region, as does the plaid pattern for LG19, with any further additions in different patterns representing potential evolutionary strata. Phylogeny adapted from Ronco et al.⁴⁴.