Table 6.

Bayesian MCMC Estimations for the Divergence Time of Each Internal Node Shown in Figure 3, Assuming the Crown Bilaterian Divergence Occurred No Earlier than 700 Ma

Node Index	Node Name	Calibration Constraints	asymAD		asym20h
		[Min, Max] (Ma)	Mean (Ma)	95% CI (Ma)	Mean (Ma)	95% CI (Ma)
a	Eutheria	[61.50, 100.50]	70.20	[60.62–86.77]	70.11	[60.64–86.84]
b	Mammalia	[124.50, 138.40]	132.57	[124.77–138.55]	132.57	[124.74–138.55]
c	Tetrapoda	[330.40, 350.10]	339.11	[330.27–349.83]	339.12	[330.26–349.85]
d	Sarcopterygii	—	388.93	[376.60–399.61]	389.21	[376.74–399.90]
e	Acanthopterygii	[96.90, 150.90]	102.63	[94.27–117.61]	102.70	[94.33–117.79]
f	Actinopterygii	[149.85, 165.20]	159.63	[150.49–165.47]	159.61	[150.49–165.45]
g	Osteichthyes	[416.00, 421.75]	418.72	[415.98–421.72]	418.73	[415.98–421.72]
h	Gnathostomata	[421.75, 462.50]	444.75	[433.64–458.91]	444.03	[432.96–458.34]
I	Vertebreta	[460.60, —]	529.34	[490.15–574.11]	528.40	[488.22–573.34]
J	Cephalochordata	—	119.34	[25.02–379.87]	116.83	[24.74–343.19]
K	Chordata	—	620.47	[560.67–665.04]	619.55	[557.46–665.14]
L	Ambulacraria	—	589.71	[463.44–652.45]	589.15	[473.08–652.14]
M	Deuterostomia	[518.50, —]	653.52	[585.50–698.50]	651.58	[580.92–698.00]
N	Bilateria	[531.50, —]	679.01	[618.90–708.77]	678.07	[615.82–708.83]

Note.—The nodes are labeled in figure 2. The calibration constraints were based on fossil records summarized by Benton et al. (2009).

CI = confidence interval.