Table 1.

Mesozoic mean sampling rates (observations per lineage per Myr), sampling probability and total richness for each of the four clades, with 95% CIs in parentheses. Note that the mean rates and probabilities were calculated weighted by the estimated richness (see the electronic supplementary material, table S2). Total Mesozoic richness was calculated using the Mesozoic mean sampling probability and the total number of species in each clade. For stage-specific sampling estimates, see figure 1 and electronic supplementary material.

clade	Mesozoic sampling rate	Mesozoic sampling probability	total Mesozoic species richness
Dinosauria	0.192 (0.146–0.262)	0.580 (0.474–0.706)	1936 (1543–2468)
Ornithischia	0.241 (0.172–0.355)	0.708 (0.575–0.847)	508 (409–668)
Sauropodomorpha	0.156 (0.084–0.304)	0.479 (0.278–0.753)	513 (307–983)
Theropoda	0.153 (0.103–0.245)	0.463 (0.335–0.628)	1115 (780–1653)