Table 4 Estimation of evolutionary divergence within localities

B. globosus overall

0.002 ± 0.000

Mupfure community

0.002 ± 0.001

Kaziro community

0.001 ± 0.001

Chihuri community

0.003 ± 0.001

Nduna community

0.000

B. truncatus overall

0.017 ± 0.003

Mupfure River

0.017 ± 0.004

Kamoyo Stream

0.000

Overall mean distance

0.022 ± 0.003