Fig. 1From: Does the oviparity-viviparity transition alter the partitioning of yolk in embryonic snakes?The phylogeny of the 20 species of snakes used in this study. The topology was inferred from the proximate phylogenetic relationships at the species-level [55,56,57,58] and drawn using Mesquite 3.04 [54]. Oviparous species are in solid font, and viviparous species in hollow fontBack to article page