Table 8. Covariance matrix for standardized data set used in principal components analysis. Abbreviations for characters defined in Figure 2. Lower half of matrix is covariance between characters. Upper half of the matrix lists probabilities that the null hypothesis that the two characters are uncorrelated (all p 0.0001, except AD (Aperture Diameter) and AAB (Aperture spacing Along Branch). Color highlights denote character groups with stronger covariance (except orange, which indicates exceptionally low).

		BW	DW	FL	FW	AD	ALB	AAB	ND	NS
	BW	*	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000
	DW	0.41	*	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000
	FL	0.33	0.29	*	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000
	FW	0.31	0.31	0.65	*	0.0000	0.0000	0.0000	0.0000	0.0000
	AD	0.29	0.34	0.21	0.23	*	0.0000	0.0207	0.0000	0.0000
	ALB	0.37	0.20	0.51	0.45	0.32	*	0.0000	0.0000	0.0000
	AAB	0.22	0.17	0.35	0.31	0.07	0.53	*	0.0000	0.0000
	ND	0.23	0.25	0.25	0.34	0.40	0.36	0.41	*	0.0000
	NS	0.21	0.32	0.55	0.46	0.34	0.21	0.19	0.34	*