Fig. 2

A summary of parsimony inference for postdentary trough transformation based on four recent phylogenies [21–24] with varying character coding. The reconstructions minimize the number of postdentary trough losses (blue) and regains (red). Note that taxon sampling differs between the studies (a-d). Placements of monotreme and therian mammals are represented by the platypus and ocelot, respectively. In Krause et al. [23] the symbols I and II indicate independent origins for australosphenidian taxa