TABLE 3.

Estimated divergence times based on minimum evolutionary analysis

Lineages splitDivergence time (mya)a
EarlyMiddleLate
Escherichia from S. enterica160120100
E. albertii from E. fergusonii, E. coli, and CI to CV755848
CIII, CIV, and CV from E. fergusonii, E. coli, CI, and CII644941
CII from E. fergusonii, E. coli, and CI604638
E. fergusonii from E. coli and CI594638
CV from CIII and CIV594538
CI from E. coli312420
CIII from CIV302319
  • a Estimates for early and middle divergence times are based on Ochman and Wilson (34). Estimates for late divergence time are based on Doolittle et al. (10).