Table 1.

Bayesian estimates for selected nodes on the chronogram in Figure 1, showing posterior probability, mean age, and 95% highest posterior probability (HPD) interval for each node of interest

Node	Description	Posterior probability	Mean age (mya)	95% HPD Interval (mya)
1	Fucales	1	25.1	16.4–39.4
2	Diversification of Sargassaceae	1	11.3	6.5–17.9
3	Diversification of Sargassum	1	4.3	2.2–6.8
4	Subgen. Sargassum	1	2.8	1.4–4.3
5	Subgen. Bactrophycus	1	2.9	1.5–4.8
6	–	0.93	2.6	1.3–4.1
7	Sect. Teretia	1	1.6	0.8–2.6
8	Sect. Halochloa	1	0.5	0.2–0.9
9	–	1	2.1	1.1–3.3
10	Sect. Binderiana	1	1.5	0.6–2.6
11	Sect. Polycystae	1	0.4	0.1–0.8
12	Sect. Ilicifolia	1	0.9	0.5–1.5
13	Sect. Zygocarpicae	0.99	0.6	0.2–1.1
14	Sect. Sargassum	0.95	1.0	0.5–1.6
15	Undefined section	0.83	1.5	0.6–2.6
16	Origin of Sargassum	1	6.7	3.4–11.0