Figure 4 in Palaeoheterodont diversity (Mollusca: Trigonioida + Unionoida): what we know and what we wish we knew about freshwater mussel evolution

Figure 4. Combined evidence phylogeny of palaeoheterodont families. Internal nodes are labelled with letters (A–F) and are the basis for the organization of the text. Synapomorphies, reconstructed from our analysis (Fig. 3), are marked along the branches. Rectangles indicate unambiguous transformations; ovals indicate transformations that have equally parsimonious alternative optimizations (Appendix 2). Character numbers are listed below each mark; shading denotes character state: white, 0; grey, 1; black,> 1 (Appendix 1).