Table 1.

Penalised likelihood estimates of root node and internal node using our Bayesian consensus phylogram.

Calibration Points (myr)	Smoothing value	Root age	Internal age
Root: 25	14.454	25.00	8.97
Root: 15	15.849	15.00	5.31
Root: 10–15	13.183	10.01	3.61
Internal: 5	69.183	13.66	5.00
Internal: 2–5	6.918	9.31	3.38

The internal node corresponds to the most recent common ancestor of the K. rugosus species complex. Ages are in units of millions of years (myr). Rate smoothing values were calculated using a cross validation method implemented in Sanderson's r8s program [83].