Fig. 1.

A series of schematic models depicting the geographic evolution of Suidae species over the past 20 Mya. a Emergence of Suidae across Eurasian and Northern Africa. b The black arrow depicts the hypothesized trajectory of Babyrussa migrating to ISEA. c Emergence of Suinae (gray collage pattern) that replaced other Suidae. d The green arrow indicates the diversification of the ancestor of Sub-Saharan suids. e Eurasian Suinae split into multiple genera (multi-color collage pattern), including pygmy hog (orange shade). f The blue arrow depicts the migrations of Sus to ISEA. The red arrow indicates emergence of Sus scrofa. g, h. The spread of Sus scrofa from southern Asia to Europe and replacement of all Suinae species except pygmy hog. During the replacement, Sus scrofa populations introgressed at least three times with one of these Suinae species (ghost linage), pygmy hog and ISEA Sus, respectively. The colors correspond to those used in Fig. 2 and represent the cluster on the tree to which the samples belong