Table 4. Estimates of molecular distance (Kimura 2-parameter model) between the nine Ornithodoros species based on 165 sequences of 16S rRNA.

	O. costalis	O. marocanus	O. occidentalis	O. merionesi	O. kairouanensis	O. erraticus	O. normandi	O. rupestris
O. sonrai	0.073 (0.013)	0.075 (0.013)	0.095 (0.017)	0.120 (0.019)	0.200 (0.025)	0.219 (0.025)	0.222 (0.026)	0.058 (0.012)
O. costalis		0.062 (0.013)	0.084 (0.015)	0.113 (0.020)	0.194 (0.022)	0.212 (0.023)	0.220 (0.026)	0.052 (0.011)
O. marocanus			0.087 (0.014)	0.113 (0.019)	0.185 (0.023)	0.209 (0.023)	0.212 (0.026)	0.061 (0.011)
O. occidentalis				0.114 (0.019)	0.204 (0.026)	0.224 (0.025)	0.242 (0.028)	0.079 (0.015)
O. merionesi					0.203 (0.026)	0.230 (0.026)	0.251 (0.030)	0.114 (0.020)
O. kairouanensis						0.186 (0.025)	0.223 (0.028)	0.184 (0.023)
O. erraticus							0.109 (0.015)	0.201 (0.023)
O. normandi								0.198 (0.023)

Standard error estimates are shown in parenthesis and were obtained by a boostrap procedure (100 replicates).