Table 1.

Most probable model of extinction rate change as a function of species age per taxonomic group and latitudinal band

Clade	Low latitude			Mid latitude			High latitude
Clade	Best model	P_best	P_const	Best model	P_best	P_const	Best model	P_best	P_const
Athyridida	strongD	0.837	0.001	strongD	0.941	0.001	mildD	0.919	0.059
Auloporida	mildD	0.515	0.014	strongD	0.537	0.018	–	–	–
Bellerophontidae	strongD	0.787	0.002	strongD	0.981	0	–	–	–
Cystiphyllida	strongD	0.498	0.026	strongD	0.600	0.035	–	–	–
Cystoporida	mildD	0.602	0.021	strongD	0.886	0.003	mildI	0.493	0.154
Desmoceratidae	strongD	0.625	0.025	strongD	0.958	0.001	strongD	0.587	0.101
Euomphalidae	strongD	0.989	0	mildD	0.764	0.105	–	–	–
Favositida	strongD	0.580	0.011	strongD	0.917	0.002	–	–	–
Fenestrida	strongD	0.988	0	mildD	0.593	0.042	mildD	0.831	0.029
Lophospiridae	strongD	0.996	0	strongD	0.921	0	–	–	–
Orthida	strongD	0.726	0.003	strongD	0.979	0	strongD	0.488	0.027
Orthotetida	strongD	0.938	0	strongD	0.972	0	constant	0.692	0.692
Productida	strongD	0.616	0.001	strongD	0.500	0.002	strongD	0.810	0.001
Proetidae	strongD	0.92	0.003	constant	0.184	0.184	constant	0.347	0.347
Pterineidae	strongD	0.905	0.005	strongD	0.997	0	–	–	–
Rhabdomesida	mildD	0.692	0.033	constant	0.385	0.385	mildD	0.764	0.021
Spiriferida	strongD	0.988	0	strongD	0.666	0.003	strongD	0.855	0.001
Spiriferinida	strongD	0.809	0.001	strongD	0.985	0	strongD	0.530	0.007
Stauriida	strongD	0.897	0.002	strongD	0.765	0.008	strongD	0.603	0.041
Strophomenida	mildD	0.796	0.024	strongD	0.982	0	strongD	0.675	0.008
Trepostomida	mildD	0.763	0.056	strongD	0.623	0.011	mildD	0.790	0.064

The models are classified as strong decrease in the rate over time (strongD), mild decrease in the rate with species age (mildD), constant rate (constant), mild rate increase (mildI). The value P__best represents the probability associated to the most probable model as estimated by the ADE‐NN, while P_{_const} is the probability associated with a model with constant extinction. Rejecting the latter when P_{_const} < 0.16 yields a Type I error rate < 0.05 (see Methods). We found no instance of strong increase in the rate over time.