Table 5. Results of pGLS regressions of internal carotid artery size on stapedial artery size.

Model	Lambda	Variable	Coefficient	P-Value	R2
(log10(CCI) ~ log10(CST))alltaxa	0.957	Intercept	1.098	<0.001	0.73
		Slope	0.776	<0.001
(log10(CCI) ~ log10(CST))ctk	0.738	Intercept	1.840	<0.001	0.89
		Slope	0.735	<0.001
(log10(CCI) ~ log10(CST))remaining	0.400	Intercept	0.892	0.02	0.75
		Slope	0.764	<0.001

Note:

CCI stands for cross-sectional area of the internal carotid artery canal. CST stands for cross-sectional area of stapedial artery canal. CTK-abbreviated model describes model only including chelonioids, trionychians, and kinosternoids. Remaining-abbreviated model includes all taxa not included in the CTK-model. Phylogenetic signal (lambda) was estimated during model fitting. R² is the generalized coefficient of determination described by Nagelkerke (1991).