Size comparison of selected structures standardized by basal length in adult stages of all studied Pantherinae species. The values of species represented by multiple specimens are averaged. The linear equation, the coefficient of determination (R²) and the p-value are given in the respective graph. A inner ear height, B cochlear length, C anterior semicircular canal radius of curvature, D lateral semicircular canal radius of curvature, E posterior semicircular canal radius of curvature. Abbreviations: ASC, anterior semicircular canal; BL, skull basal length; co-L, cochlear length; IEH, inner ear height; LSC, lateral semicircular canal; PSC, posterior semicircular canal; R, radius of curvature.