Figure 2 in Phylogeny explains better than ecology or body size the variation of the first lower molar in didelphid marsupials

Figure 2: Phylogenetic hypothesis of species used (Didelphidae) constructed from articles by Voss and Jansa (2009) and secondarily Cardillo et al. (2004), in addition to Pine et al. (2013) for MonodelphiS. Main tribes are according to Voss and Jansa (2009). Time is in millions of years (My).