Table 1

Comparison of the divergence times (in My) of various rodents estimated from the age of L1 subfamilies with those derived from DNA/DNA hybridization

Dichotomy comparedL1 subfamily(ies) Time (or range) of splitDNA/DNA hybridization
Rattus sensu lato/ L1mur1 *
 other Murines 12 ± 2.5 12.2
Maxomys/other rats A-2 B-1
<7.3  ±  1.4>5.7  ±  1.67.6
Maxomys rajah/ A-2 K
M. whiteheadi<7.3  ±  1.4>2.1  ±  0.74.3
Leopoldamys and H
Niviventer/other rats≈5.7 ± 0.75.4
Leopoldamys/Niviventer B-2 I
<5.3  ±  1.4>3.4  ±  0.73.3
Berylmys/other rats C-2
≈2.8 ± 1.33.3
Sundamys/other rats D-1
≈2.9 ± 1.12.5
Bandicota/other rats F
≈2.6 ± 0.92.5
  • The DNA/DNA hybridization data are from ref. 33 (table 6). 

  • * From refs. 28 and 29

  • This value was obtained by calibrating the Mus/Rattus dichotomy from the fossil record at 12.2 Mya (33, 42). 

  • This value is very similar to those for the D and D-1 subfamilies, which arose soon after Berylmys split from the other rats.