Figure 2

Phylogeny of the study species with key characters mapped. Characters are coded as follows: (I) echolocation type: broadband (yellow); constant frequency (red); FM (green); none (grey); tongue-clicks (blue); non-laryngeal echolocation (purple); (II) number of cochlear turns and (III) relative basilar membrane length. Clades are numbered as follows: (1) monotremes; (2) marsupials; (3) Afrotheria; (4) Primates; (5) Glires; (6) Carnivora; (7) Cetartiodactyla; (8) Perissodactyla; (9) Chiroptera. Branch colours indicate: Monotremes and marsupials (black); Non-bat placental mammals (brown); Yangochiroptera (green); echolocating Yinpterochiroptera (blue); non-echolocating Old World fruit bats (Pteropodidae) (orange). Representative examples of cochlear reconstructions for 18 species (a-r) are shown.