Figure 1. Numbers of intact, partial and pseudo Tas2r genes and dietary preferences (C: Carnivore; I: Insectivore; O: Omnivore; H: Herbivore) of the 19 reptile species.

Species tree and divergence times were taken from the literatures and TimeTree (http://www.timetree.org/, see Table S4). “*”indicates no Tas2r gene was as detected in the common garter snake.