Table 1 Selected results of model-fitting procedure.

Group	Parameter	AICc		Spearman's rank		Pearson’s PMCC
		Likelihood	Weight	Rho	Adjusted P value	r	Adjusted P value
Crocodyliformes (marine)	Palaeotemp.	22.741	0.237	−0.524	0.634	−0.522	0.678
Crocodyliformes (non-marine)	Sea level	26.285	0.969	0.750	0.175	0.846	0.028
Lissamphibia	Palaeotemp.	38.260	0.796	0.700	0.301	0.742	0.154
Mammaliaformes	Sea level	51.394	0.931	−0.450	0.537	−0.666	0.301
Ornithischia	Sea level	60.106	0.391	0.200	0.681	0.047	0.898
Pterosauria	Sea level	33.261	0.872	0.714	0.406	0.647	0.581
Sauropodomorpha	Sea level	41.191	0.501	0.310	0.810	0.457	0.564
Sauropterygia	Sea level	41.820	0.409	0.055	0.906	0.065	0.985
Testudines	Palaeotemp.	50.648	0.258	0.343	0.880	0.462	0.891
Theropoda	Sea level	72.931	0.534	−0.018	0.968	0.037	0.954

For complete results for both subsampled and raw taxonomic diversity, see Supplementary Information 7. Data for sea level from Miller et al.⁵³, and for palaeotemperature (Palaeotemp.) from the δ¹⁸O proxy from Prokoph et al.⁵⁴.

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