Table 1.

Eigenvalues for inner ear structures.

Structure	PC loadings
	PC1	PC2	PC3
A. Linear measurements (n = 26)
Total ear size	− 0.995	0.090	− 0.013
Saccule	− 0.983	0.185	− 0.010
Lagena	− 0.972	− 0.170	− 0.144
Utricle	− 0.960	− 0.214	0.143
Mean canal diameter	− 0.845	0.108	0.327
Mean ampulla diameter	− 0.824	− 0.034	0.491
Standard deviation	0.062	0.010	0.008
Proportion variance	0.947	0.027	0.017
Cumulative variation	0.947	0.974	0.991
Lambda (λ)	0.455	–	–
B. Volume measurements (n = 10)
Total ear volume	− 0.997	0.084	0.024
Saccule	− 0.983	0.159	− 0.088
Lagena	− 0.991	− 0.087	− 0.075
Utricle	− 0.960	− 0.275	− 0.015
Macula neglecta	− 0.996	− 0.016	0.082
Semi− circular canals	− 0.991	0.065	0.120
Standard deviation	0.152	0.021	0.012
Proportion variance	0.974	0.019	0.006
Cumulative variation	0.974	0.993	0.999
Lambda (λ)	0	–	–

Eigenvalues for the three main principal components, using (A) linear measurements from 26 species and (B) volumetric measurements from 10 species.