Figure 4

Schematic figure with a comparison of the pulmonary vascularization in Osteichthyes with potentially functional air-breathing organs (modified from Longo et al. 2013). (a) The actinopterygian Polypterus senegalus. (b) the holostean Amia calva. (c) the fossil coelacanth Macropoma mantelli. (d) the lungfish Protopterus dolloi. C celiacomesenteric artery, Da dorsal aorta, Lp left pulmonary artery, Rp right pulmonary artery.