Ancient tropical extinctions contributed to the latitudinal diversity gradient

<p>Appendix 1 includes the results of the biogeographical reconstruction of Testudines, Crocodilia and Squamata inferred from a Lagrange dispersal&ndash;extinction&ndash;cladogenesis (DEC) under three different models; unconstrained, Unc.; soft fossil constraint, SFC; and hard fossil constraint model, HFC (see methods). The uncertainty associated with these reconstructions is provided in additional .txt files for each group/model. For each reconstruction, ancestral scenarios are indicated with letters that correspond with our three operational areas: Holarctic (a), equator (b), southern temperate regions (c). In the ancestral scenarios, the symbol &ldquo;|&rdquo; splits the ranges inherited by each descendant lineage. Node numbers could be found on the tree supplied.</p> <p>&nbsp;</p>