Figure 2. Evolution of the bony fishes (actinopterygians and sarcopteryigians) depicted the old-fashioned, "branching tree" way. The relationships among the various lobe-finned fishes (crossopterygians, lungfish, coelacanths) and the amphibia differ from those shown in Figure 1, which is based principally on molecular evidence. From Romer, A. S. 1964. The Vertebrate Body. W. B. Saunders. Philadelphia.