FIGURE 5 in Review Renewed perspectives on the sedentary-pelagic last common bilaterian ancestor

FIGURE 5 Reconstructions of the adult states of the sedentary/semi-sedentary stem groups (indicated by asterisks) with well-defined clonal reproduction in the major bilaterian lineages Deuterostomia, Lophotrochozoa and Ecdysozoa and the semi-sedentary/motile crown groups with reduced clonality (based on recent or fossil taxa, except for the reconstructed stem-chordata). The drawings and text from bottom to top are meant to illustrate the evolutionary changes along these lineages. The cephalic shield and potential derived structures (foot and mantle, see assessment of the potential homology in the text) are indicated by yellow, the oral lobes indicated by green, the stolon and tail by blue, the protoconch-like structures by violet, and the gut by red. ARTWORK BY TATIANA KORSHUNOVA