Table 1. The d_N and d_S values and ratios for the interspecies comparisons of the fem and fem1/csd genes.

			fem gene			fem1/csd gene			dN/dSfem
Clade	Species		dN (SE)	dS (SE)	dN/dS	dN (SE)	dS (SE)	dN/dS	<dN/dSfem 1/csd *
Apis	Ador	Amel	0.02 (0.004)	0.09 (0.02)	0.22	0.13 (0.01)	0.13 (0.02)	1.00	P<0.0001
	Amel	Acer	0.01 (0.003)	0.08 (0.02)	0.13	0.12 (0.01)	0.15 (0.02)	0.8	P<0.0001
Bombus	Bter	Bimp	0.008 (0.003)	0.051 (0.013)	0.16	0.05 (0.007)	0.09 (0.02)	0.56	P<0.01
	Cflo	Hsal	0.26 (0.01)	0.51 (0.029)	0.51	0.35 (0.02)	0.5 (0.03)	0.7	P<0.01
	Cflo	Pbar	0.19 (0.01)	0.44 (0.03)	0.43	0.3 (0.01)	0.43 (0.03)	0.7	P<0.01
Ants	Hsal	Pbar	0.24 (0.01)	0.53 (0.03)	0.45	0.26 (0.01)	0.46 (0.03)	0.57	P<0.02
	Acep	Pbar	0.11 (0.01)	0.37 (0.03)	0.30	0.16 (0.01)	0.41 (0.03)	0.39	P<0.05
	Cflo	Acep	0.21 (0.01)	0.46 (0.03)	0.46	0.32 (0.01)	0.49 (0.03)	0.65	P<0.01
	Acep	Hsal	0.23 (0.01)	0.5 (0.03)	0.46	0.28 (0.01)	0.44 (0.03)	0.64	P<0.01

Species names: Amel, A. mellifera; Ador, A. dorsata; Acer, A. cerana; Bimp, B. impatiens; Bter, B. terrestris; Hsal, H. saltator; Pbar, P. barbatus; Acep, Atta cephalotes; Cflo, Camponotus floridanus. SE: standard error.

*A one-tailed χ² - test was conducted using the absolute number of synonymous and nonsynonymous differences.